Open-source middleware software
2362 open-source libraries, tools and applications tagged middleware, ranked by how closely middleware 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.
2362 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| ASP.NET Core ASP.NET Core is the open-source, cross-platform web framework for .NET, used to build modern cloud-based web applications, APIs, IoT apps, … | 97 | 38467 | stable |
| ASP.NET Core ASP.NET Core is an open‑source, cross‑platform framework for building modern cloud‑based web applications and services with .NET and C#. It… | 97 | 38467 | active |
| fastify/fastify Fastify is a high‑performance web framework for Node.js that emphasizes low overhead and developer experience. It provides a powerful plugi… | 99 | 37268 | active |
| songquanpeng/one-api One API is a self-hosted LLM API gateway and key management system that unifies OpenAI, Azure, Anthropic Claude, Google Gemini, DeepSeek, a… | 52 | 37040 | stable |
| Netty Netty is an asynchronous event-driven network application framework for the JVM, enabling rapid development of high-performance protocol se… | 96 | 35065 | stable |
| Netty Netty is an asynchronous event‑driven network application framework written in Java. It provides a flexible, high‑performance foundation fo… | 96 | 35065 | active |
| Laravel Laravel is a full‑stack PHP web application framework that provides expressive, elegant syntax and a rich set of tools for building modern … | 95 | 34966 | active |
| Laravel Laravel is a batteries-included PHP web application framework with expressive syntax, covering routing, ORM (Eloquent), templating (Blade),… | 95 | 34966 | stable |
| go-zero go-zero is a cloud-native Go web and RPC microservices framework with built-in engineering practices like circuit breaking, rate limiting, … | 95 | 33372 | stable |
| gethomepage/homepage Homepage is a modern, fully static, fast and secure startpage/dashboard built with Next.js and React. It provides a highly customizable int… | 100 | 33217 | active |
| Hono Hono is a small, simple, and ultrafast web framework built on Web Standards. It runs on any JavaScript runtime, including Cloudflare Worker… | 95 | 32549 | active |
| Symfony Symfony is a full-stack PHP framework for building web and console applications, plus a set of reusable, decoupled PHP components used by p… | 93 | 31168 | stable |
| Supermemory Supermemory is a fast, scalable memory and context engine for AI agents, offered as a hosted API with self‑hosted options. It provides auto… | 89 | 31077 | active |
| Uppy Uppy is a modular, open‑source JavaScript file uploader that runs in the browser and can be integrated with any web app. It provides a rich… | 93 | 31010 | active |
| decolua/9router 9Router is a self-hosted AI gateway/router that connects AI coding tools like Claude Code, Cursor, Codex, and Cline to 60+ LLM providers th… | 74 | 30634 | active |
| encode/django-rest-framework Django REST framework is a powerful and flexible toolkit for building Web APIs on top of Django. It provides serializers, class-based views… | 98 | 30205 | stable |
| Authelia Authelia is an open-source authentication and authorization server and portal providing single sign-on (SSO) and multi-factor authenticatio… | 98 | 29294 | active |
| Envoy Envoy is an open‑source, high‑performance edge and service proxy written in C++. It provides dynamic routing, load‑balancing, TLS terminati… | 95 | 29082 | active |
| Envoy Envoy is a CNCF-hosted, high-performance C++ edge, middle, and service proxy designed for cloud-native and AI-native applications. It provi… | 95 | 29082 | stable |
| rohitg00/agentmemory AgentMemory is a TypeScript library that provides persistent, local‑first memory for AI coding agents. It captures, compresses, and recalls… | 78 | 28900 | active |
| Semantic Kernel Semantic Kernel is a model‑agnostic SDK that lets developers integrate large language models and build AI agents quickly. It provides tools… | 94 | 28687 | active |
| cloudflare/pingora Pingora is a Rust framework from Cloudflare for building fast, reliable, and programmable network services such as HTTP proxies and load ba… | 85 | 27603 | stable |
| tokio-rs/axum Axum is an HTTP routing and request-handling library for Rust built on Tokio, focusing on ergonomics and modularity. It integrates deeply w… | 89 | 27309 | stable |
| Apollo Apollo is an open-source autonomous driving platform providing a high-performance, modular software stack for developing, testing, and depl… | 54 | 26853 | active |
| Kratos Kratos is a lightweight Go framework for building cloud-native microservices, offering APIs for transport (HTTP/gRPC), middleware, registry… | 88 | 25972 | active |
| Kratos Kratos is a lightweight Go framework for building cloud‑native microservices. It provides generated HTTP/gRPC transports, composable middle… | 88 | 25972 | active |
| rwf2/Rocket Rocket is an async web framework for Rust focused on usability, security, extensibility, and speed. It provides macro-based routing, compil… | 46 | 25783 | stable |
| kataras/iris Iris is a high‑performance, feature‑rich web framework for Go that supports HTTP/2, MVC, dependency injection, and many built‑in middleware… | 62 | 25555 | active |
| Actix Web Actix Web is a fast, pragmatic web framework for Rust that provides type‑safe request handling, routing, and middleware. It supports async … | 100 | 24864 | active |
| Actix Web Actix Web is a powerful, pragmatic, and extremely fast asynchronous web framework for Rust. It provides type-safe routing, flexible respond… | 100 | 24864 | stable |
| zama-ai/fhevm FHEVM is a full-stack framework from Zama that enables confidential smart contracts on EVM-compatible blockchains using Fully Homomorphic E… | 81 | 24800 | active |
| SafeLine SafeLine is a self‑hosted Web Application Firewall and reverse‑proxy written in Go. It protects web services by filtering malicious HTTP tr… | 96 | 22725 | active |
| tornadoweb/tornado Tornado is a Python web framework and asynchronous networking library that uses non‑blocking I/O. It provides tools for building high‑concu… | 76 | 22171 | active |
| QwikDev/qwik Qwik is a modern web framework that enables instant‑loading applications by deferring JavaScript execution until user interaction. It uses … | 93 | 22068 | active |
| vercel/chatbot Chatbot is an open‑source, full‑featured template built with Next.js and the Vercel AI SDK. It provides a ready‑to‑deploy AI chat applicati… | 67 | 20983 | active |
| gofr-dev/gofr GoFr is an opinionated Go framework that accelerates microservice development with built‑in support for databases, gRPC, HTTP, and observab… | 90 | 20855 | active |
| Apache ShardingSphere Apache ShardingSphere is an open‑source distributed database ecosystem that provides sharding, read/write splitting, encryption, and distri… | 77 | 20808 | active |
| Apache ShardingSphere Apache ShardingSphere is an enterprise distributed database ecosystem that turns heterogeneous databases (MySQL, PostgreSQL, etc.) into a d… | 77 | 20808 | stable |
| jasontaylordev/CleanArchitecture Clean Architecture Solution Template is a .NET CLI template that scaffolds a full‑stack ASP.NET Core application following Clean Architectu… | 88 | 20640 | active |
| Apache Casbin Apache Casbin is an open-source authorization library that enforces access control using models such as ACL, RBAC, ABAC, ReBAC, and MAC, de… | 96 | 20433 | stable |
| LibreSpark/LibreTV LibreTV is a lightweight, free, self-hostable web application for searching and streaming video content aggregated from multiple third-part… | 65 | 20009 | active |
| grpc-gateway A protoc plugin that reads protobuf service definitions with google.api.http annotations and generates a reverse-proxy server translating R… | 100 | 20006 | stable |
| Apollo Client Apollo Client is a TypeScript/JavaScript library that simplifies GraphQL data fetching and caching in web and native applications. It provi… | 94 | 19805 | active |
| Elysia Elysia is a TypeScript‑first web framework that provides end‑to‑end type safety and a highly ergonomic API. It runs on Bun and Node.js, off… | 93 | 19239 | active |
| Elysia Elysia is a TypeScript backend web framework built for Bun, emphasizing end-to-end type safety, schema-driven validation, and ergonomic dev… | 93 | 19239 | active |
| AdonisJS AdonisJS is a TypeScript‑first full‑stack web framework for Node.js that provides a cohesive set of batteries‑included features such as ORM… | 98 | 19142 | active |
| µWebSockets µWebSockets is a C/C++ web server library providing highly optimized HTTP and WebSocket handling with a built-in URL router and pub/sub fea… | 92 | 18993 | stable |
| Egg.js Egg.js is a Node.js web framework built on Koa that provides a full‑stack solution for enterprise applications. It offers a powerful plugin… | 98 | 18985 | active |
| iii iii is an open‑source engine that lets you compose, extend, and observe any service or AI agent as a worker in real time. It provides a uni… | 85 | 18844 | active |
| Sanic Sanic is a Python 3.10+ asynchronous web framework and server designed for speed. It provides a lightweight, unopinionated API with built‑i… | 78 | 18634 | active |
| Sanic Sanic is a fast, asynchronous Python web framework and web server supporting async/await syntax and ASGI compliance. It bundles a productio… | 78 | 18634 | stable |
| APIJSON APIJSON is a Tencent open-source Java ORM and JSON-based API protocol that auto-generates CRUD APIs and documentation without backend codin… | 98 | 18400 | active |
| LangChain LangChain.js is a TypeScript framework for building LLM-powered applications, providing standard interfaces for agents, models, embeddings,… | 95 | 18284 | active |
| bcit-ci/CodeIgniter CodeIgniter is an open-source PHP framework with a very small footprint for building full-featured web applications, encouraging but not en… | 32 | 18154 | active |
| Million.js Million.js is an optimizing compiler for React that replaces React's virtual DOM reconciliation with a faster 'block' virtual DOM that diff… | 57 | 17661 | active |
| lidge-jun/opencodex opencodex is a lightweight local proxy (installed via npm, running on a bundled Bun runtime) that translates OpenAI Codex's Responses API a… | 77 | 17631 | active |
| ZLMediaKit/ZLMediaKit ZLMediaKit is a high-performance, enterprise-grade streaming media server framework written in C++11, supporting RTSP, RTMP, HLS, HTTP-FLV,… | 76 | 17593 | stable |
| Effect Effect is a TypeScript library and ecosystem for building production-grade, type-safe applications, centered on the Effect type that encode… | 95 | 17323 | stable |
| Pipecat Pipecat is an open-source Python framework (BSD-2) for building real-time voice and multimodal conversational AI agents. It orchestrates sp… | 89 | 16579 | active |
| aiohttp aiohttp is an asynchronous HTTP client and server framework for Python built on asyncio. It supports client and server WebSockets out of th… | 99 | 16572 | stable |
| ArduPilot ArduPilot is an open-source autopilot firmware suite (ArduPlane, ArduCopter, ArduRover, ArduSub) written in C++ that controls unmanned vehi… | 100 | 16081 | stable |
| Gotify Gotify is a self-hosted server for sending and receiving real-time messages over WebSocket, with a REST API for pushing messages and a slee… | 98 | 16059 | stable |
| Quarkus Quarkus is a cloud-native Java framework optimized for containers and Kubernetes, offering fast startup, low memory footprint, and GraalVM … | 94 | 15944 | stable |
| Whistle Whistle is a cross-platform, Node.js-based network debugging and packet-capture proxy supporting HTTP, HTTPS, HTTP/2, WebSocket, and TCP tr… | 76 | 15720 | active |
| corsairdev/corsair Corsair is an open-source TypeScript integration layer that lets applications and AI agents connect to 200+ third-party services (GitHub, S… | 57 | 15309 | active |
| Feathers Feathers is a full-stack framework for building web APIs and real-time applications in TypeScript or JavaScript. It provides a service-orie… | 97 | 15257 | stable |
| ZITADEL ZITADEL is an open-source identity and access management (IAM) platform providing authentication and authorization out of the box, includin… | 93 | 15193 | active |
| TanStack/router TanStack Router is a fully type-safe, client-first router for React and Solid applications, with file-based routing, nested layouts, loader… | 93 | 15143 | active |
| OpenWA OpenWA is a free, MIT-licensed, self-hosted WhatsApp API Gateway that wraps WhatsApp connections in a REST API with webhooks, a React dashb… | 78 | 15142 | active |
| CrowdSec CrowdSec is an open-source, crowdsourced security engine that analyzes logs and HTTP requests to detect malicious behavior and block offend… | 92 | 15138 | stable |
| janpaepke/ScrollMagic ScrollMagic is a lightweight, zero-dependency JavaScript/TypeScript library for reacting to the user's scroll position, built as a convenie… | 76 | 14955 | active |
| hapijs/hapi @hapi/hapi is a mature Node.js web framework for building HTTP servers and APIs with secure defaults, a rich plugin system, and zero extern… | 66 | 14786 | stable |
| Logto Logto is an open-source identity and access management (IAM) infrastructure for SaaS and AI applications, built on OIDC, OAuth 2.1, and SAM… | 100 | 14728 | active |
| Ktor Ktor is an asynchronous web framework for Kotlin, built by JetBrains on top of coroutines, for creating servers, microservices, and multipl… | 98 | 14548 | stable |
| ABP Framework ABP Framework is an open-source, opinionated application framework for building enterprise web applications on .NET and ASP.NET Core. It pr… | 97 | 14441 | active |
| CoreDNS CoreDNS is a fast and flexible DNS server and forwarder written in Go that chains plugins, each performing a DNS function. It is a CNCF gra… | 91 | 14365 | stable |
| Drogon Drogon is a C++14/17/20-based HTTP web application framework for building high-performance web application servers. It uses non-blocking I/… | 82 | 14326 | active |
| Yii2 Framework Yii 2 is a high-performance, full-stack PHP framework for building modern web applications and APIs. It ships with an ORM (Active Record), … | 81 | 14285 | stable |
| OpenResty OpenResty is a full-fledged web platform that bundles an enhanced Nginx core, LuaJIT, and many Nginx modules and Lua libraries into a singl… | 78 | 14044 | stable |
| arut/nginx-rtmp-module An NGINX module that turns the nginx web server into a media streaming server supporting RTMP, HLS, and MPEG-DASH. It handles live streamin… | 32 | 14027 | stable |
| Instructor Instructor is a Python library that patches LLM clients to return validated, type-safe structured data using Pydantic models, with automati… | 94 | 13980 | stable |
| apollographql/apollo-server Apollo Server is a spec-compliant, production-ready GraphQL server library for Node.js that supports schema-first development. It integrate… | 90 | 13952 | stable |
| RabbitMQ RabbitMQ is an open source, multi-protocol messaging and streaming broker supporting AMQP 0-9-1, AMQP 1.0, MQTT, STOMP, and its Streams pro… | 98 | 13928 | stable |
| freshframework/fresh Fresh is a full-stack web framework for Deno that renders server-generated HTML with Preact and ships JavaScript only for interactive 'isla… | 90 | 13792 | active |
| Nakama Nakama is a scalable open-source game backend server written in Go that provides multiplayer sessions, matchmaking, leaderboards, chat, and… | 98 | 13514 | stable |
| Tengine Tengine is a high-performance web server and reverse proxy forked from nginx, developed by Taobao/Alibaba since 2011. It is 100% nginx-comp… | 83 | 13385 | active |
| GoFrame GoFrame is a modular, high-performance full-stack development framework for Go, comparable to Laravel or Spring Boot, offering batteries-in… | 97 | 13287 | active |
| cloudwego/eino Eino is a Go-based framework for building LLM and AI applications, inspired by LangChain and LlamaIndex but following Go conventions. It pr… | 83 | 13269 | active |
| Debezium Debezium is an open source distributed platform for change data capture (CDC) that streams row-level database changes as events, most commo… | 77 | 13237 | stable |
| cesanta/mongoose Mongoose is a two-file C networking library and embedded web server providing HTTP, WebSocket, MQTT, TLS 1.3, and an optional built-in TCP/… | 91 | 13080 | stable |
| graphile/crystal Graphile's Crystal monorepo containing Grafast, a planning and execution engine for GraphQL.js, and PostGraphile, which auto-generates high… | 94 | 12935 | active |
| go-admin go-admin is a front-end/back-end separated admin management system scaffold built on Gin (Go) and Vue 3 with Element UI, Arco Design, and A… | 98 | 12800 | active |
| NangoHQ/nango Nango is an open-source integration platform for building product integrations with 900+ pre-built API providers. It handles OAuth/API-key … | 95 | 12694 | active |
| Kludex/starlette Starlette is a lightweight, production-ready ASGI framework and toolkit for building async web services in Python. It provides HTTP and Web… | 100 | 12674 | stable |
| Play Framework Play Framework is a high-velocity, reactive web framework for Java and Scala running on the JVM. It offers a stateless, non-blocking archit… | 90 | 12617 | active |
| grpc/grpc-rust Tonic is a Rust implementation of gRPC over HTTP/2, providing async/await client and server support built on hyper and tokio, with prost-ba… | 91 | 12495 | stable |
| boardgameio/boardgame.io boardgame.io is an open-source JavaScript/TypeScript engine for building turn-based games. Developers write simple move functions and the f… | 75 | 12458 | stable |
| Sinatra Sinatra is a Ruby DSL for quickly creating web applications with minimal effort, built on Rack. It provides routing, filters, sessions, and… | 70 | 12454 | stable |
| keephq/keep Keep is an open-source AIOps and alert management platform that consolidates alerts from 90+ monitoring tools into a single pane of glass w… | 92 | 12417 | active |
| Erlang/OTP Erlang/OTP is the Erlang programming language together with its runtime system (BEAM) and the Open Telecom Platform, a set of libraries and… | 94 | 12361 | stable |