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 |
|---|---|---|---|
| upstash/jstack JStack is a lightweight, end-to-end typesafe framework for building fast Next.js 15 applications, built on Hono, Tailwind, and Drizzle ORM.… | 27 | 3743 | active |
| Codex++ Codex++ is a tweak loader that patches the OpenAI Codex desktop app to load local tweaks from a user-directory runtime, enabling UI changes… | 10 | 3741 | active |
| springdoc-openapi springdoc-openapi is a Java library that automatically generates OpenAPI 3 API documentation for Spring Boot applications, with built-in Sw… | 94 | 3738 | stable |
| PHP-CRUD-API A single-file PHP script that automatically exposes a full-featured REST API on top of a MySQL/MariaDB, PostgreSQL, SQL Server, or SQLite d… | 93 | 3738 | stable |
| doublesymmetry/react-native-track-player A React Native audio player library built on the New Architecture (JSI/TurboModules) providing background playback, queue management, cachi… | 98 | 3709 | active |
| maruel/panicparse panicparse is a Go tool and library that parses Go panic stack traces, densifies and deduplicates goroutines with similar stacks, and rende… | 68 | 3707 | stable |
| odigos-io/odigos Odigos is an open-source distributed tracing and observability platform for Kubernetes and VMs that instruments applications automatically … | 92 | 3677 | active |
| pallets/quart Quart is an async Python web application framework that reimplements Flask's API on top of asyncio and ASGI. It supports HTML templating, J… | 96 | 3673 | stable |
| networknt/light-4j Light-4J is a fast, lightweight, cloud-native microservices framework for Java built on the Undertow HTTP core. It offers a small memory fo… | 94 | 3673 | active |
| LangChain A lightweight Python library that adapts Anthropic Model Context Protocol (MCP) tools into LangChain/LangGraph-compatible tools. It provide… | 10 | 3650 | active |
| Arcenox-co/TickerQ TickerQ is a fast, reflection-free background job scheduler for .NET that uses C# source generators to register job handlers at compile tim… | 88 | 3645 | active |
| Tailchat Tailchat is an open-source, self-hostable instant messaging application ('noIM' - not only IM) built with React and Node.js, designed as a … | 86 | 3629 | active |
| go-oauth2/oauth2 A Go library for building OAuth 2.0 authorization servers that issue and manage access tokens. It supports the standard OAuth 2.0 protocol … | 83 | 3623 | stable |
| kennethreitz/responder Responder is a Python HTTP service framework with a Flask/Falcon-style request-response model, built on Starlette and ASGI. It bundles batt… | 85 | 3617 | active |
| ory/oathkeeper Ory Oathkeeper is a cloud native Identity & Access Proxy (IAP) and Access Control Decision API written in Go that authenticates, authorizes… | 74 | 3605 | active |
| animir/node-rate-limiter-flexible A Node.js/Deno library for counting and limiting events with atomic rate limiting across many backends including Redis, Valkey, Memcached, … | 96 | 3589 | stable |
| abhinavsingh/proxy.py proxy.py is a fast, lightweight, zero-dependency Python library and CLI tool for building HTTP/HTTPS proxy servers and web servers, with pl… | 67 | 3552 | active |
| Eclipse ThreadX Eclipse ThreadX is an advanced real-time operating system (RTOS) for deeply embedded applications, featuring a picokernel architecture, pre… | 90 | 3538 | active |
| ardatan/graphql-mesh GraphQL Mesh is a GraphQL federation framework and gateway that converts non-GraphQL API services (REST/OpenAPI, gRPC, SOAP, OData, Thrift,… | 95 | 3511 | active |
| Lighthouse Lighthouse is a GraphQL server framework that integrates with Laravel applications, letting you define your API schema using the GraphQL Sc… | 94 | 3498 | active |
| OpenTelemetry JavaScript The official OpenTelemetry JavaScript API and SDK for instrumenting Node.js and browser applications to generate distributed traces, metric… | 94 | 3487 | active |
| actor-framework/actor-framework CAF (C++ Actor Framework) is an open-source implementation of the Actor Model in C++, providing lightweight actors, network-transparent mes… | 86 | 3442 | stable |
| mayuki/Cocona Cocona is a micro-framework for building .NET console applications with an ASP.NET Core-like minimal API style. It provides UNIX-style comm… | 10 | 3442 | active |
| zigzap/zap Zap is a fast, robust web microframework for Zig that wraps the facil.io C networking library to build HTTP servers and REST APIs. It provi… | 10 | 3416 | stable |
| rocicorp/mono Zero is a general-purpose sync engine for the web that syncs slices of a Postgres database into a client-side local datastore, letting quer… | 67 | 3414 | active |
| apache/linkis Apache Linkis is a computation middleware layer that sits between upper-layer applications and underlying big data engines such as Spark, H… | 67 | 3412 | stable |
| web-infra-dev/rsbuild Rsbuild is a fast, extensible build tool for modern web applications, powered by the Rust-based Rspack bundler. It provides zero-configurat… | 92 | 3404 | active |
| 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 |
| TARS TarsGo is a high-performance RPC and microservice framework for Go built on the Tars protocol, part of the Linux Foundation's Tars project.… | 35 | 3371 | stable |
| Blitz.js Blitz.js is a fullstack toolkit built on top of Next.js that adds a typesafe RPC data layer, authentication/authorization, and code scaffol… | 54 | 14125 | maintenance |
| austintoddj/canvas Canvas is an open-source publishing platform for Laravel that installs as a Composer package, adding a distraction-free writing editor, med… | 94 | 3356 | active |
| workos/authkit AuthKit is WorkOS's authentication UI and User Management platform, offering a fully themeable hosted login box or a headless API for build… | 70 | 3346 | active |
| ts-rest/ts-rest ts-rest is a TypeScript library for defining a shared API contract that both client and server consume, providing end-to-end type safety fo… | 60 | 3341 | active |
| samber/cc-skills-golang A curated collection of 46 Go-specific agent skills (reusable instruction sets) for AI coding assistants like Claude Code, Codex, Gemini CL… | 77 | 3337 | active |
| sqshq/piggymetrics PiggyMetrics is a personal financial advisor application built as a reference implementation of the microservice architecture pattern using… | 23 | 13965 | maintenance |
| zalando/skipper Skipper is an HTTP router and reverse proxy written in Go, designed for service composition with support for hundreds of thousands of dynam… | 94 | 3332 | stable |
| gpac/gpac GPAC is an open-source multimedia framework for processing, inspecting, packaging, streaming, and playing audio, video, subtitles, encrypte… | 87 | 3313 | stable |
| huangxd-/danmu_api A JavaScript-based danmaku (bullet comment) API server that aggregates danmu from major Chinese and international video platforms (Bilibili… | 63 | 3309 | active |
| Tencent/spring-cloud-tencent Spring Cloud Tencent is a Spring Cloud-based service governance framework from Tencent that implements the standard Spring Cloud SPI and in… | 94 | 3297 | active |
| Powertools for AWS Lambda Powertools for AWS Lambda is a developer toolkit (available for Python, TypeScript, Java, and .NET) that implements serverless best practic… | 100 | 3294 | stable |
| shrinerb/shrine Shrine is a modular file attachment toolkit for Ruby applications that handles uploading, storing, processing, and serving files across man… | 75 | 3284 | stable |
| OvenMediaEngine OvenMediaEngine is an open-source (AGPL-3.0) C++ live streaming server that ingests streams via WebRTC, SRT, RTMP, RTSP, and MPEG-2 TS and … | 87 | 3277 | active |
| jfinal/jfinal JFinal is a lightweight Java web + ORM framework combining MVC architecture with an ActiveRecord-style database layer and the Enjoy templat… | 75 | 3270 | stable |
| amov-lab/Prometheus Prometheus is an open-source autonomous drone software system platform built on PX4 flight controller firmware and ROS. It provides onboard… | 53 | 3270 | active |
| microsurging/surging Surging is a distributed microservice engine for .NET Core providing a lightweight, high-performance, modular RPC pipeline with service reg… | 53 | 3264 | active |
| Eclipse Zenoh Zenoh is a Rust-implemented pub/sub/query protocol and library that unifies data in motion, data at rest, and computations with minimal wir… | 97 | 3259 | active |
| Apache Gravitino Apache Gravitino is a high-performance, geo-distributed, federated metadata lake that provides unified metadata management across diverse d… | 93 | 3259 | active |
| ANYbotics/grid_map A C++ library with a ROS interface for managing multi-layered 2D grid maps for mobile robotic mapping, storing data like elevation, travers… | 47 | 3252 | active |
| dotnet/extensions A suite of .NET libraries from Microsoft providing production-ready capabilities such as resilience pipelines, telemetry, diagnostics, comp… | 98 | 3220 | 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 |
| remult/remult Remult is a full-stack TypeScript CRUD framework that uses TypeScript entity classes as a single source of truth to generate a secure REST … | 92 | 3210 | active |
| CodisLabs/codis Codis is a proxy-based, high-performance Redis cluster solution written in Go that provides transparent sharding and dynamic resharding wit… | 23 | 13219 | maintenance |
| Revel Framework Revel is a high-productivity, full-stack MVC web framework for the Go language. It bundles routing, parameter parsing, validation, sessions… | 23 | 13214 | maintenance |
| strongloop/loopback LoopBack is a highly-extensible Node.js framework for building dynamic end-to-end REST APIs and microservices with model-driven development… | 23 | 13158 | maintenance |
| libp2p libp2p is a modular peer-to-peer networking stack and protocol suite, originally extracted from IPFS, with implementations in Go, Rust, Jav… | 66 | 3144 | stable |
| chronoxor/NetCoreServer NetCoreServer is an ultra fast, low latency asynchronous socket server and client library for C# .NET Core. It supports TCP, SSL, UDP, Unix… | 68 | 3128 | stable |
| walinejs/waline Waline is a self-hostable comment system for websites and blogs, consisting of a lightweight JavaScript client and a backend server deploya… | 93 | 3125 | active |
| squid-cache/squid Squid is a mature, full-featured caching web proxy supporting HTTP, HTTPS, and FTP, with extensive access controls, content adaptation via … | 93 | 3121 | stable |
| Apiato Apiato is a PHP framework built on top of Laravel for creating scalable, testable, API-centric applications using the Porto architectural p… | 72 | 3108 | active |
| link1st/gowebsocket A distributed instant messaging (IM) chat system built in Go on top of WebSocket, designed to support up to a million concurrent connection… | 66 | 3106 | active |
| acl-dev/acl Acl is a cross-platform C/C++ network communication library and server programming framework supporting Linux, Windows, macOS, FreeBSD, And… | 86 | 3103 | stable |
| davidfowl/TodoApp A sample Todo application built with ASP.NET Core, featuring a Blazor WebAssembly frontend and a Minimal APIs REST backend. It demonstrates… | 59 | 3098 | active |
| facebook/wangle Wangle is a C++ networking library providing composable client/server abstractions for building protocols, application clients, and servers… | 96 | 3093 | active |
| envoyproxy/gateway Envoy Gateway is an open-source control plane that manages Envoy Proxy as a standalone or Kubernetes-based application gateway, using Kuber… | 99 | 3091 | stable |
| tsedio/tsed Ts.ED is a TypeScript framework for Node.js and Bun built on top of Express.js, Koa.js, or Fastify.js, using decorators and class-based arc… | 93 | 3089 | active |
| kubernetes-sigs/kueue Kueue is a Kubernetes-native job queueing system providing APIs and controllers that decide when batch, HPC, and AI/ML workloads should be … | 95 | 3086 | active |
| igniterealtime/Openfire Openfire is an open-source (Apache-2.0) real-time collaboration server implementing the XMPP (Jabber) protocol, written in Java. It provide… | 91 | 3073 | stable |
| Nchan Nchan is a scalable pub/sub message server and proxy implemented as an Nginx module, supporting Websocket, EventSource (SSE), long-polling,… | 75 | 3066 | stable |
| EasyNetQ/EasyNetQ EasyNetQ is an easy-to-use .NET client API for RabbitMQ that simplifies pub/sub messaging, delayed scheduling, and RPC over an AMQP broker.… | 95 | 3060 | active |
| jeremykenedy/laravel-auth A complete Laravel 12 starter application with email registration verification, social authentication via Socialite, user roles and permiss… | 98 | 3041 | active |
| vpulim/node-soap A Node.js library providing both a SOAP client and a SOAP server, with WSDL parsing, SOAP header handling, security options, and async meth… | 97 | 3037 | active |
| xyproto/algernon Algernon is a small, self-contained web server and application server written in pure Go, bundling HTTP/2, HTTP/3 (QUIC), Lua/Teal scriptin… | 90 | 3033 | active |
| twitter/twemproxy Twemproxy (nutcracker) is a fast, lightweight proxy for the memcached and Redis protocols, written in C. It reduces backend connection coun… | 23 | 12338 | maintenance |
| busboy Busboy is a Node.js library that provides a streaming parser for HTML form data, primarily multipart/form-data uploads. It emits events for… | 32 | 2996 | stable |
| Sablier Sablier is an open-source scale-to-zero service that starts containers and workloads on demand and stops them automatically after inactivit… | 96 | 2988 | active |
| Geode Geode is a fan-made mod loader and modding SDK for Geometry Dash, providing a comprehensive toolkit for creating compatible mods in C++. It… | 100 | 2986 | active |
| userver-framework/userver userver is a production-ready open-source C++ asynchronous framework with coroutines for building microservices, services, and utilities. I… | 93 | 2982 | stable |
| kamailio/kamailio Kamailio is an open source SIP signaling server (RFC3261) written in C, designed for large-scale VoIP and real-time communication platforms… | 95 | 2978 | stable |
| nicolasff/webdis Webdis is a lightweight HTTP server written in C that exposes Redis commands over HTTP with JSON output. It supports JSONP, chunked pub/sub… | 66 | 2963 | active |
| mikestefanello/pagoda Pagoda is a full-stack web development starter kit and admin panel written in Go, providing authentication, ORM-based entities, sessions, a… | 92 | 2958 | active |
| OpenMind/OM1 OM1 is a modular AI runtime and hardware abstraction layer for building multimodal AI agents that run on physical robots and in simulators.… | 77 | 2933 | active |
| tinyhttp/tinyhttp tinyhttp is a modern, Express-like web framework for Node.js written in TypeScript and compiled to native ESM. It offers a minimal dependen… | 89 | 2905 | active |
| Pomelo Game Server Framework Pomelo is a fast, scalable, distributed game server framework for Node.js with a multi-process architecture and plugin-based extensibility.… | 10 | 11862 | maintenance |
| destan19/OpenAppFilter OpenAppFilter (OAF) is a parental control and application filtering plugin for OpenWrt routers, built as a kernel module, service daemon, a… | 91 | 2904 | active |
| Tencent/VasSonic VasSonic is a lightweight hybrid framework from Tencent that accelerates the first screen load of H5 pages inside native Android and iOS We… | 23 | 11847 | maintenance |
| frain-dev/convoy Convoy is an open-source, high-performance webhooks gateway for reliably ingesting, persisting, debugging, and delivering webhook events at… | 95 | 2877 | active |
| django-compressor/django-compressor A Django app that combines and minifies linked and inline JavaScript and CSS in templates into single cacheable static files. It supports c… | 76 | 2870 | stable |
| Sponge Sponge is a Go development framework built on a 'Definition is Code' philosophy that generates modular backend code from SQL, Protobuf, and… | 61 | 2870 | active |
| Caliburn-Micro/Caliburn.Micro Caliburn.Micro is a small, powerful MVVM framework for building applications across all XAML platforms including WPF, UWP, WinUI3, Avalonia… | 68 | 2867 | active |
| LyricTian/gin-admin A full-featured RBAC admin scaffolding framework for Go built on Gin, GORM 2.0, Casbin 2.0, and Wire dependency injection. It ships with JW… | 31 | 2867 | active |
| tfranzel/drf-spectacular drf-spectacular is a Python library that generates OpenAPI 3 (3.0, 3.1, and 3.2) schema specifications for Django REST framework APIs. It e… | 80 | 2863 | active |
| dotnetcore/osharp OSharp is a rapid development framework for .NET 6.0+ that wraps AspNetCore modules such as configuration, dependency injection, logging, c… | 66 | 2845 | active |
| ThinkPHP ThinkPHP is a high-performance, lightweight PHP web application framework with two decades of development history, now rebuilt on PHP 8.0+.… | 62 | 2814 | active |
| opensolon/solon Solon is a Java enterprise application development framework built from scratch as a lighter, faster alternative to Spring Boot/Spring Clou… | 92 | 2794 | active |
| http4k http4k is a lightweight, functional HTTP toolkit for Kotlin where applications are just functions from Request to Response, with no annotat… | 95 | 2792 | stable |
| unpoly/unpoly Unpoly is a JavaScript library that adds progressive enhancement attributes to HTML, letting you build dynamic, SPA-like interfaces while k… | 76 | 2791 | active |
| Pedestal Pedestal is a set of Clojure libraries for building server-side services, APIs, and web applications on the JVM. It provides an interceptor… | 65 | 2783 | active |
| geziyor/geziyor Geziyor is a fast web crawling and scraping framework for Go, supporting JavaScript rendering via Chrome, caching, proxy management, and au… | 69 | 2782 | active |
| Misago Misago is a full-featured, modern forum application built with Django, Python, and HTMX, designed to be fast, scalable, and responsive. It … | 87 | 2777 | active |
| mojolicious/mojo Mojolicious is a real-time web framework for Perl that supports MVC web applications, WebSockets, and non-blocking I/O with a built-in web … | 72 | 2747 | active |