Open-source backend software
4203 open-source libraries, tools and applications tagged backend, ranked by how closely backend is their primary purpose, then by adoption and maintenance health. Each entry links to a page with sources, use cases and when to choose or avoid it.
4203 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| FreeAPI.app FreeAPI is an open-source hub of free, production-style REST APIs (auth, e-commerce, social media, todos, and more) for practicing API inte… | 53 | 9836 | active |
| OpenFeign/feign Feign is a Java library that simplifies writing HTTP clients by binding annotated interfaces to templatized HTTP requests. It supports plug… | 96 | 9801 | stable |
| pocket-id/pocket-id Pocket ID is a self-hosted, OpenID Connect Certified identity provider that lets users sign in to applications using passkeys instead of pa… | 87 | 9666 | active |
| spring-projects/spring-petclinic Spring PetClinic is the official Spring sample application: a Spring Boot web app that manages a veterinary clinic's owners, pets, veterina… | 73 | 9548 | active |
| Spring AI Spring AI is an application framework for AI engineering that provides Spring-friendly, portable abstractions for integrating AI models int… | 94 | 9542 | active |
| mark3labs/mcp-go A Go SDK implementing the Model Context Protocol (MCP), letting developers build MCP servers that expose tools, resources, and prompts to L… | 85 | 9180 | active |
| Yearning Yearning is a self-hosted web-based SQL audit platform for MySQL, providing audit tickets with approval workflows, automated syntax checkin… | 75 | 8969 | active |
| owncloud/core ownCloud Core is the server-side component of ownCloud Classic, a self-hosted file storage, sync, and sharing platform written in PHP. It p… | 99 | 8837 | stable |
| oapi-codegen/oapi-codegen oapi-codegen is a command-line tool and Go library that generates Go server boilerplate, API clients, and HTTP models from OpenAPI 3.0/3.1 … | 91 | 8629 | active |
| openapi-ts/openapi-typescript A monorepo of tools for consuming OpenAPI schemas in TypeScript, centered on openapi-typescript which converts OpenAPI 3.0/3.1 specs into s… | 80 | 8380 | stable |
| tinyauthapp/tinyauth Tinyauth is a lightweight, OpenID Certified™ authentication and authorization server written in Go, shipped as a single static binary. It w… | 86 | 8366 | active |
| warp-tech/warpgate Warpgate is an open-source, clientless bastion host and privileged access management (PAM) tool written in Rust that transparently proxies … | 98 | 8038 | active |
| InvenTree InvenTree is an open-source inventory management system built with Python and Django, providing a web interface and REST API for tracking p… | 96 | 7747 | active |
| fabiolb/fabio Fabio is an HTTP, HTTPS, TCP, and gRPC reverse proxy and load balancer that configures itself dynamically from service data stored in Consu… | 92 | 7346 | active |
| telepresenceio/telepresence Telepresence is a CNCF open-source CLI tool that connects a developer's workstation to a remote Kubernetes or OpenShift cluster, creating a… | 97 | 7311 | active |
| presidentbeef/brakeman Brakeman is a free, open-source static analysis security scanner built specifically for Ruby on Rails applications. It analyzes Rails sourc… | 95 | 7286 | stable |
| tbphp/gpt-load GPT-Load is a high-performance, enterprise-grade AI API transparent proxy service built in Go that aggregates multiple AI providers (OpenAI… | 83 | 7158 | active |
| hhyo/Archery Archery is a self-hosted SQL audit and query platform built with Django. It provides SQL review, execution, querying, backup, session and a… | 76 | 7064 | active |
| paper-trail-gem/paper_trail PaperTrail is a Ruby gem that tracks changes to Rails ActiveRecord models, recording every create, update, and destroy as versioned snapsho… | 66 | 7029 | stable |
| dinerojs/dinero.js Dinero.js is a JavaScript and TypeScript library for creating, calculating, converting, comparing, and formatting monetary values safely. I… | 88 | 6802 | stable |
| PHP OAuth2 Server A standards-compliant OAuth 2.0 authorization server library for PHP, supporting all major grants (authorization code, client credentials, … | 88 | 6668 | stable |
| Javen205/IJPay IJPay is a lightweight Java payment SDK that wraps WeChat Pay, Alipay, QQ Pay, JD Pay, UnionPay, and PayPal into a unified, framework-agnos… | 26 | 6603 | active |
| Aspire Aspire is a multi-language, code-first toolchain from Microsoft for composing, running, debugging, and deploying distributed applications. … | 96 | 6382 | active |
| Apache Camel Apache Camel is an open-source integration framework offering 350+ connectors for databases, APIs, message brokers, and cloud services, wit… | 77 | 6371 | stable |
| sanity-io/sanity Sanity Studio is an open-source, fully customizable headless CMS application built with React and TypeScript for rapidly configuring conten… | 93 | 6338 | active |
| AWS SDK for PHP The official AWS SDK for PHP (version 3), providing idiomatic PHP client APIs for over 400 Amazon Web Services including S3, DynamoDB, EC2,… | 94 | 6206 | stable |
| foxcpp/maddy Maddy is a composable all-in-one mail server written in Go that combines an SMTP MTA/MX, IMAP storage, and email security protocols (DKIM, … | 98 | 6107 | active |
| OpenCloud OpenCloud is an open source file management, sharing, and collaboration platform written in Go, positioned as a sovereign alternative to Ne… | 86 | 6056 | active |
| dolanmiu/docx docx is a JavaScript/TypeScript library for generating and modifying Microsoft Word .docx files with a declarative API. It runs in both Nod… | 100 | 5972 | stable |
| samchon/typia Typia is a TypeScript transformer library that compiles pure TypeScript types into super-fast runtime validators, JSON serializers/parsers,… | 93 | 5921 | active |
| hacdias/webdav A simple, standalone WebDAV server written in Go, distributable as a single binary or Docker image. It supports user authentication, TLS, a… | 99 | 5920 | active |
| goproxyio/goproxy A Go module proxy server that caches and serves Go modules, available both as a hosted global service (goproxy.io) and as a self-hostable b… | 23 | 5868 | active |
| easegress-io/easegress Easegress is a cloud-native traffic orchestration system that acts as an API gateway, reverse proxy, and traffic manager with built-in Raft… | 78 | 5867 | active |
| Faka Card System A self-hosted PHP e-commerce application for selling digital goods and card keys (faka), with an anime/2D-culture themed storefront. It inc… | 98 | 5854 | active |
| lanproxy lanproxy is a self-hosted NAT traversal / reverse proxy tool that exposes machines behind a firewall to the public internet by forwarding T… | 41 | 5845 | active |
| novel novel is a learning-oriented, full-stack novel/fiction CMS built with Spring Boot 3 and Vue 3 in a front-end/back-end separated architectur… | 64 | 5827 | active |
| mscdex/ssh2 SSH2 client and server modules written in pure JavaScript for Node.js. It supports exec, shell, SFTP, port forwarding, and custom HTTP(S) a… | 73 | 5825 | stable |
| AidLux (AidLearning) AidLux (originally AidLearning) is an AIoT development platform that runs a native Ubuntu Linux environment with GUI, deep learning tooling… | 63 | 5812 | active |
| go-pay/gopay GoPay is an aggregated payment SDK for Go that wraps WeChat Pay, Alipay, Douyin Pay, PayPal, Apple Pay, QQ Pay, Allinpay, Lakala, CMB, and … | 92 | 5788 | active |
| partykit/partykit PartyKit is a framework and platform for building realtime multiplayer applications using JavaScript/TypeScript servers ('parties') deploye… | 78 | 5728 | active |
| kgateway-dev/kgateway kgateway is a Kubernetes-native API gateway and ingress controller that implements the Kubernetes Gateway API as a control plane for Envoy … | 100 | 5713 | stable |
| yournextstore/yournextstore Your Next Store is an open-source, AI-native Next.js e-commerce template powered by Stripe, with a typesafe Commerce Kit SDK. It is designe… | 65 | 5521 | active |
| permitio/opal OPAL (Open Policy Administration Layer) is an administration layer for policy engines such as Open Policy Agent (OPA) and Cedar Agent. It d… | 95 | 5513 | active |
| hey-api/hey-api Hey API is an ecosystem of code generators that turn OpenAPI specifications into production-ready SDKs, types, validators, and mocks. Its f… | 83 | 5498 | active |
| kanidm/kanidm Kanidm is a simple, secure, and fast identity management platform written in Rust that acts as a complete identity provider for other appli… | 98 | 5492 | active |
| leokhoa/laragon Laragon is a portable, isolated, lightweight development environment for Windows that bundles and orchestrates PHP, Node.js, Python, Apache… | 87 | 5445 | active |
| sadmann7/skateshop An open-source e-commerce skateshop web application built with Next.js 14 and the T3 stack, featuring a storefront, seller and customer wor… | 33 | 5445 | active |
| apache/opendal Apache OpenDAL is an Open Data Access Layer providing one unified API to access object storage, file systems, cloud SaaS, databases, protoc… | 98 | 5400 | stable |
| Pay An elegant PHP payment SDK supporting Alipay, WeChat Pay, UnionPay (Unipay), Douyin Pay, and Jiangsu Bank e-payment gateways. It features a… | 83 | 5370 | stable |
| novicezk/midjourney-proxy A Java-based proxy service that wraps MidJourney's Discord channel into a REST API, enabling programmatic AI image generation. It supports … | 42 | 5361 | active |
| QOR QOR is a set of modular Go libraries that abstract common features needed for building business applications, CMSs, and e-commerce systems,… | 64 | 5345 | active |
| silenceper/wechat A simple and easy-to-use WeChat SDK for Go covering Official Accounts, Mini Programs, Mini Games, WeChat Pay, Open Platform, and WeCom (Ent… | 84 | 5306 | active |
| devspace-sh/devspace DevSpace is a client-only, open-source CLI tool for Kubernetes that automates image building and deployment workflows and lets developers b… | 85 | 5198 | active |
| Taubyte Tau Taubyte (tau) is an open-source, self-hosted fullstack cloud platform that lets developers and AI coding agents build, test, and ship appli… | 74 | 5174 | active |
| mediacms-io/mediacms MediaCMS is an open source, self-hosted video and media CMS built with Django and React, exposing a REST API. It supports video, audio, ima… | 100 | 5161 | active |
| jazzband/django-silk django-silk (Silk) is a live profiling and inspection tool for the Django framework. It intercepts and stores HTTP requests and database qu… | 97 | 4995 | active |
| Bitcore Bitcore is a full-stack monorepo from BitPay providing infrastructure for building Bitcoin and blockchain-based applications, including a b… | 67 | 4982 | active |
| Statamic CMS Statamic is a flat-first, Laravel-powered content management system distributed as a Composer package that installs into an existing Larave… | 95 | 4906 | active |
| rivet-dev/agentos agentOS is a library that gives AI agents a lightweight operating system running inside your existing backend process, using WebAssembly an… | 94 | 4809 | active |
| antoniomika/sish sish is an open-source, self-hostable SSH server that provides HTTP(S), WebSocket(S), and TCP tunnels to localhost, serving as an ngrok/ser… | 96 | 4795 | active |
| linhaojun857/aurora Aurora is a self-hosted, front-end/back-end separated personal blog system built with SpringBoot (Java) and Vue. It includes an admin dashb… | 40 | 4662 | active |
| IBM/mcp-context-forge ContextForge is an open-source AI gateway, registry, and proxy from IBM that federates MCP, A2A, and REST/gRPC APIs behind a unified endpoi… | 86 | 4646 | active |
| JetBrains/koog Koog is a JetBrains-built Kotlin/Java framework for creating fault-tolerant, enterprise-ready AI agents on the JVM, with multiplatform depl… | 86 | 4617 | active |
| activemerchant/active_merchant Active Merchant is a Ruby payment abstraction library extracted from Shopify that provides a unified API across dozens of payment gateways.… | 89 | 4603 | stable |
| get-convex/chef Chef is an AI-powered full-stack web app builder by the Convex team, forked from bolt.diy, that generates apps with a built-in reactive dat… | 55 | 4599 | active |
| Embabel Agent Framework Embabel Agent is an agentic AI framework for the JVM, written in Kotlin with first-class Java and Spring Boot support. It provides typed, g… | 87 | 4528 | active |
| emissary-ingress/emissary Emissary-ingress is an open-source, Kubernetes-native API gateway, Layer 7 load balancer, and Kubernetes Ingress built on Envoy Proxy. It i… | 83 | 4521 | stable |
| Google Cloud Go Client Libraries The official Google Cloud Client Libraries for Go, providing idiomatic Go packages for accessing Google Cloud Platform services such as Sto… | 95 | 4520 | active |
| rocboss/paopao-ce PaoPao is an open-source, self-hosted micro-community (social) platform combining a Go/Gin backend with a Vue 3 + Naive UI web frontend and… | 62 | 4501 | active |
| tapexyz/tape Tape is an open-source, decentralized video and media-sharing platform built as a TypeScript monorepo with web, API, embed player, and smar… | 57 | 4453 | active |
| ankane/strong_migrations A Ruby gem for Rails that catches unsafe database migrations in development by detecting potentially dangerous operations like removing col… | 75 | 4449 | stable |
| opcodesio/log-viewer A Laravel package providing a fast, browser-based UI for viewing, searching, and filtering application log files. It supports Laravel, Hori… | 83 | 4445 | active |
| wechatpy/wechatpy wechatpy is a third-party Python SDK for the WeChat (微信) official platform ecosystem. It wraps APIs for official accounts, WeChat Pay, WeCo… | 56 | 4307 | active |
| baidu/braft braft is an industrial-grade C++ implementation of the RAFT consensus algorithm and replicated state machine, built on top of brpc. It is d… | 23 | 4230 | stable |
| octelium/octelium Octelium is a free, open-source, self-hosted unified zero trust secure access platform built on Kubernetes. It can operate as a remote acce… | 87 | 4107 | active |
| OAuth2 Server A Node.js module for implementing a fully RFC 6749/6750 compliant OAuth2 server/provider, framework-agnostic with official wrappers for Exp… | 23 | 4063 | active |
| koxudaxi/datamodel-code-generator A Python CLI tool that generates type-safe Python data models (Pydantic v2, dataclasses, TypedDict, msgspec.Struct) from schema definitions… | 95 | 4042 | active |
| badrisnarayanan/antigravity-claude-proxy A Node.js proxy server that exposes Antigravity's Cloud Code Claude and Gemini models behind an Anthropic-compatible Messages API. It trans… | 74 | 4004 | active |
| Lightning-AI/LitServe LitServe is a Python framework for building custom AI inference servers with full control over batching, routing, streaming, and scaling lo… | 92 | 3956 | active |
| MiniProfiler/rack-mini-profiler Rack middleware that displays a speed badge on every HTML page with detailed performance profiling for Ruby web apps. It provides database … | 70 | 3904 | active |
| Ballerina Ballerina is an open-source, cloud-native programming language optimized for integration, developed by WSO2, with built-in support for JSON… | 98 | 3864 | active |
| node-oidc-provider A Node.js library implementing an OpenID Certified OAuth 2.0 Authorization Server with full OpenID Connect support. It is highly configurab… | 95 | 3816 | active |
| WPGraphQL WPGraphQL is a free, open-source WordPress plugin that exposes an extendable GraphQL schema and API for any WordPress site. It lets develop… | 95 | 3794 | active |
| deanxv/coze-discord-proxy A self-hosted Go service that proxies conversations to a Coze-Bot on Discord, exposing OpenAI-compatible API endpoints (v1/chat/completions… | 55 | 3778 | stable |
| aws/aws-sdk-go-v2 The official AWS SDK version 2 for the Go programming language, providing clients and utilities for all AWS services such as S3, EC2, and D… | 94 | 3662 | stable |
| mitchellh/libxev libxev is a cross-platform, high-performance event loop library written in Zig that provides a unified proactor-style API for non-blocking … | 77 | 3588 | stable |
| espocrm/espocrm EspoCRM is a free, open-source CRM web application with a PHP REST API backend and a single-page application frontend. It manages leads, co… | 98 | 3478 | stable |
| ding113/claude-code-hub CC Hub is a self-hosted AI API proxy and gateway service for Claude Code, Codex, and other OpenAI/Claude-compatible APIs, built with Next.j… | 83 | 3402 | active |
| awslabs/aws-sdk-rust The official AWS SDK for Rust, providing one generated crate per AWS service plus a shared aws-config crate for credential and region loadi… | 94 | 3343 | stable |
| ShopXO ShopXO is a free, MIT-licensed enterprise-grade B2C e-commerce system built on ThinkPHP8 (PHP). It supports PC, H5, mini-programs (WeChat, … | 76 | 3333 | active |
| adelsz/pgtyped PgTyped is a TypeScript library that generates static types for raw SQL queries against a running PostgreSQL database. It parses queries fr… | 74 | 3285 | active |
| vouch/vouch-proxy Vouch Proxy is an SSO and OAuth/OIDC authentication proxy for Nginx that uses the auth_request module to protect upstream sites. It support… | 75 | 3283 | active |
| TanStack/ai TanStack AI is a type-safe, provider-agnostic TypeScript SDK for building AI applications with streaming chat, tool calling, agents, struct… | 81 | 3213 | active |
| googleapis/google-cloud-node The official Google Cloud Client Library for Node.js, a monorepo containing idiomatic npm client libraries for interacting with individual … | 96 | 3209 | stable |
| dosco/graphjin GraphJin is a Go compiler and runtime that turns GraphQL queries into optimized, policy-checked SQL across many databases, files, and APIs,… | 94 | 3204 | active |
| Fable Fable is an open-source F# compiler that translates F# code to JavaScript, TypeScript, Python, Rust, Dart, and Erlang/BEAM. It makes F# a f… | 99 | 3152 | active |
| graphprotocol/graph-node Graph Node is the core indexing component of The Graph protocol, written in Rust. It extracts and organizes data from blockchains such as E… | 91 | 3151 | active |
| aspen-cloud/triplit Triplit is an open-source full-stack syncing database that runs on both server and client, syncing data in real time over websockets with c… | 51 | 3115 | active |
| SciSharp/BotSharp BotSharp is an open-source multi-agent AI framework written in C# for .NET, providing an agent abstraction layer, conversation state manage… | 77 | 3114 | active |
| dwgx/WindsurfAPI A zero-dependency Node.js reverse proxy that exposes Windsurf/Devin Desktop's 100+ cloud AI models (Claude, GPT, Gemini, DeepSeek, Kimi, GL… | 79 | 3105 | active |