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 |
|---|---|---|---|
| asLody/VirtualApp VirtualApp is an Android virtualization/sandbox engine that lets apps run inside a host app without being installed on the system, acting a… | 76 | 11104 | maintenance |
| xiaonanln/goworld GoWorld is a scalable distributed game server engine written in Go, featuring spaces and entities with AOI support, hot-swappable game logi… | 42 | 2720 | active |
| MetaMCP MetaMCP is a self-hosted MCP proxy that aggregates multiple MCP servers into a unified MCP endpoint, with namespaces, tool cherry-picking, … | 64 | 2718 | active |
| Join Monster Join Monster is a JavaScript library that acts as a query execution layer between GraphQL and SQL databases, translating GraphQL queries in… | 35 | 2697 | active |
| KrakenD KrakenD Community Edition is an open-source, stateless, high-performance API Gateway written in Go that aggregates, transforms, secures, an… | 99 | 2691 | stable |
| walkor/webman Webman is a high-performance PHP web framework built on Workerman that integrates HTTP, WebSocket, TCP, and UDP services. It uses resident … | 74 | 2691 | active |
| MetapriseAI/OrgKernel OrgKernel is an open-source trust layer for AI agents providing cryptographic agent identity (Ed25519), scoped execution tokens, SHA-256 ha… | 53 | 2685 | active |
| bestruirui/octopus Octopus is a self-hosted LLM API aggregation gateway that unifies multiple provider channels behind a single endpoint, converting between O… | 79 | 2682 | active |
| ealush/vest Vest is a declarative validation framework for JavaScript/TypeScript that lets you write validation rules like unit tests using a Jest-styl… | 99 | 2668 | active |
| OpenTelemetry Java OpenTelemetry auto-instrumentation for Java, providing a Java agent JAR that attaches to any Java 8+ application and injects bytecode to ca… | 99 | 2654 | active |
| Apache Casbin jCasbin is an Apache-licensed Java authorization library that enforces access control using models such as ACL, RBAC, and ABAC defined in c… | 86 | 2650 | stable |
| scalatra/scalatra Scalatra is a tiny, Sinatra-inspired web micro-framework for Scala that runs on the JVM. It lets developers build high-performance, asynchr… | 76 | 2647 | active |
| ZeroBot-Plugin A large collection of practical plugins for the ZeroBot framework implementing the OneBot v11 protocol, written in Go. It powers QQ bots (v… | 76 | 2646 | active |
| vercel/micro Micro is a minimal asynchronous HTTP framework for building microservices in Node.js using async/await. It provides a tiny, dependency-ligh… | 57 | 10629 | maintenance |
| absmach/magistrala Magistrala is an open-source, multi-tenant IoT platform framework written in Go that provides device management, messaging, identity, and a… | 97 | 2645 | active |
| KubeArmor KubeArmor is a cloud-native runtime security enforcement system that restricts process execution, file access, and networking behavior of p… | 100 | 2631 | active |
| http4s Http4s is a minimal, idiomatic Scala library for building HTTP servers and clients, serving as Scala's equivalent to Rack, WSGI, WAI, and S… | 94 | 2626 | stable |
| ory/fosite Fosite is a security-first, extensible OAuth 2.0 and OpenID Connect SDK for Go, implementing RFC 6749, RFC 6819, PKCE, and OpenID Connect C… | 54 | 2618 | active |
| FreeRADIUS/freeradius-server FreeRADIUS is a high-performance, highly configurable multi-protocol policy server supporting RADIUS, DHCPv4/v6, DNS, TACACS+, and VMPS, wr… | 84 | 2614 | stable |
| risesoft-y9/Digital-Infrastructure Digital-Infrastructure (数字底座) is a Java/Spring Boot + Vue 3 rapid development platform for large government and enterprise digital transfor… | 63 | 2613 | active |
| amberframework/amber Amber is a full-stack web application framework for the Crystal language, inspired by Rails, Phoenix, and Kemal, providing routing, control… | 80 | 2606 | active |
| clj-commons/aleph Aleph is a Clojure library for asynchronous network communication built on Netty, providing an HTTP server and client plus raw TCP and UDP … | 73 | 2592 | active |
| API Platform API Platform is a full-stack PHP framework built on Symfony (and Laravel) for creating API-first projects with hypermedia REST or GraphQL A… | 94 | 2577 | stable |
| samanhappy/mcphub MCPHub is a self-hosted hub that centrally manages multiple Model Context Protocol (MCP) servers and exposes them through unified Streamabl… | 84 | 2567 | active |
| http-kit http-kit is a minimalist, high-performance, event-driven HTTP client and server for Clojure, fully Ring-compatible as a drop-in replacement… | 63 | 2564 | stable |
| Wire Wire is an open-source, end-to-end encrypted messaging and collaboration platform whose server components are written primarily in Haskell.… | 56 | 2550 | active |
| lovoo/goka Goka is a compact yet powerful distributed stream processing library for Apache Kafka written in Go. It extends Kafka consumer groups by bi… | 88 | 2548 | active |
| Ash Framework Ash is a declarative, extensible application framework for Elixir that lets you model your domain as typed resources and derive APIs, persi… | 96 | 2539 | active |
| ntex ntex is a Rust framework for building composable asynchronous network services, supporting HTTP and WebSockets. It is runtime-agnostic, let… | 93 | 2538 | active |
| pac4j pac4j is a Java security engine for authenticating users, managing profiles, and enforcing authorizations across web applications and servi… | 77 | 2535 | stable |
| SpectoLabs/hoverfly Hoverfly is a lightweight open-source API simulation and service virtualization tool written in Go. It captures HTTP/HTTPS traffic and repl… | 97 | 2524 | active |
| mqant mqant is a concise, high-performance distributed microservice framework written in Go, originally designed for real-time game servers. It p… | 32 | 2515 | active |
| sofastack/sofa-bolt SOFABolt is a lightweight, high-performance network remoting framework for Java built on Netty, developed by Ant Financial. It provides con… | 67 | 2505 | stable |
| Symfony Security SecurityBundle is the official Symfony bundle that integrates the Security component into the Symfony full-stack framework. It provides con… | 93 | 2490 | stable |
| Brighter Brighter is a Command Dispatcher and Command Processor framework for .NET and C# that implements the Command pattern with a middleware pipe… | 99 | 2486 | active |
| vercel/workflow Workflow SDK is a TypeScript library that makes async functions durable via 'use workflow' and 'use step' directives, providing suspend/res… | 81 | 2467 | active |
| lihengming/spring-boot-api-project-seed A Spring Boot and MyBatis based seed/boilerplate project for quickly building small-to-medium RESTful API projects in Java. It provides bes… | 23 | 9680 | maintenance |
| Saloon Saloon is a PHP library for rapidly building third-party API integrations and SDKs using Connector and Request classes. It is framework-agn… | 96 | 2442 | active |
| Spark Spark is a tiny, expressive web framework for Java 8+ (with a Kotlin DSL) inspired by Sinatra, letting you define routes with lambdas in a … | 32 | 9636 | maintenance |
| nz-m/SocialEcho SocialEcho is a full-featured social networking platform built on the MERN stack (MongoDB, Express.js, React.js, Node.js) with automated co… | 31 | 2433 | active |
| go-eagle/eagle Eagle is a lightweight Go microservice framework for rapidly building HTTP and gRPC API services. It bundles production-grade components in… | 56 | 2427 | active |
| vercel/chat Chat SDK is a unified TypeScript SDK for building chat bots and AI agents that run across Slack, Microsoft Teams, Google Chat, Discord, Tel… | 80 | 2410 | active |
| learnhouse/learnhouse LearnHouse is a next-generation open-source learning management system (LMS) for creating, sharing, and selling educational content. It com… | 100 | 2404 | active |
| gaul/s3proxy S3Proxy is a Java service that implements the Amazon S3 API and proxies requests to other storage backends such as Google Cloud Storage, Az… | 92 | 2404 | stable |
| OPCFoundation/UA-.NETStandard The official OPC Foundation reference implementation of the OPC Unified Architecture (OPC UA) protocol for .NET, providing client, server, … | 92 | 2393 | stable |
| Mentra-Community/MentraOS MentraOS is an open-source operating system and development platform for smart glasses, providing pairing, connection management, data stre… | 92 | 2389 | active |
| VCP VCPToolBox is a Node.js middleware layer deployed between LLM APIs and frontend applications, providing a unified Variable & Command Protoc… | 80 | 2389 | active |
| RSocket RSocket Java is the reference Java implementation of the RSocket application protocol, a binary protocol for Reactive Streams semantics ove… | 23 | 2388 | stable |
| AnyCable AnyCable is an open-source realtime server written in Go that provides reliable two-way communication over WebSockets and SSE with built-in… | 97 | 2384 | stable |
| SignalR ASP.NET SignalR is a .NET library that makes it simple to add real-time web functionality to ASP.NET (System.Web/Katana) applications, lett… | 38 | 9399 | maintenance |
| dingo/api Dingo API is a PHP package that provides tools for building RESTful APIs on top of the Laravel and Lumen frameworks. It offers content nego… | 23 | 9378 | maintenance |
| nelmio/NelmioApiDocBundle A Symfony bundle that generates OpenAPI/Swagger documentation for REST APIs from PHP 8 attributes and code analysis. It exposes interactive… | 92 | 2368 | active |
| gotd/td gotd/td is a full MTProto 2.0 Telegram API client library written in pure Go, supporting both user accounts and bots with generated binding… | 97 | 2358 | stable |
| Neoteroi/BlackSheep BlackSheep is a fast asynchronous ASGI web framework for Python, inspired by Flask and ASP.NET Core. It features built-in dependency inject… | 91 | 2358 | active |
| Oinone AI-Powered Low-Code Framework Oinone Pamirs is the Java back-end of Oinone, an AI-powered low-code framework that is 100% metadata-driven and positions itself as infrast… | 61 | 2350 | active |
| Levanter WhatsApp Bot A feature-rich WhatsApp user bot built in JavaScript that supports running multiple WhatsApp sessions from one instance, with a plugin syst… | 67 | 2349 | active |
| zzzprojects/EntityFramework-Plus Entity Framework Plus is a free, open-source .NET library that extends EF6 and EF Core DbContexts with features like Batch Delete, Batch Up… | 95 | 2346 | active |
| mirumee/ariadne Ariadne is a Python library for building GraphQL servers using a schema-first approach, where the API is defined in SDL and business logic … | 98 | 2345 | stable |
| fruitbars/simple-one-api A single-binary Go gateway that unifies access to multiple LLM providers (Qianfan, iFlytek Spark, Tencent Hunyuan, MiniMax, DeepSeek, etc.)… | 90 | 2345 | active |
| walkor/phpsocket.io A server-side PHP implementation of the socket.io protocol built on the Workerman event-driven networking framework. It lets PHP applicatio… | 79 | 2343 | active |
| orbitjs/orbit Orbit is a composable TypeScript data framework for orchestrating access, transformation, and synchronization across multiple data sources … | 48 | 2339 | active |
| harlanc/xiu Xiu is a high-performance live streaming media server written in pure Rust, supporting RTMP (with clustering), RTSP, WebRTC (WHIP/WHEP), HT… | 67 | 2329 | active |
| jwadow/kiro-gateway A self-hosted proxy API gateway for the Kiro API (Amazon Q Developer / AWS CodeWhisperer) that exposes Claude and other models through Open… | 59 | 2325 | active |
| gjtorikian/html-pipeline A Ruby library providing a small framework of chainable filters for processing user-supplied content into HTML. It supports text filters, c… | 63 | 2323 | active |
| JSONAPI-Resources/jsonapi-resources JSONAPI::Resources (JR) is a Ruby gem that provides a resource-focused framework for building JSON:API compliant API servers on Rails 5.1+.… | 68 | 2322 | active |
| gotham-rs/gotham Gotham is a flexible web framework for Rust built on Tokio and Hyper, emphasizing stability, safety, security, and speed. It is statically … | 85 | 2312 | active |
| feige996/unibest unibest is a cross-platform uniapp starter framework built on Vue 3, TypeScript, Vite 5, UnoCSS, and Wot UI, developed in VS Code without H… | 73 | 2293 | active |
| ladjs/lad Lad is a Node.js MVC web framework built on Koa, created by a former Express TC and Koa team member. It provides an opinionated full-stack … | 44 | 2286 | active |
| Kong/swrv swrv is a Vue Composition API library for remote data fetching using the stale-while-revalidate caching strategy. It serves cached data imm… | 86 | 2278 | active |
| twitter/finatra Finatra is a lightweight Scala framework for building fast, testable HTTP and Thrift services on top of TwitterServer and Finagle. It provi… | 36 | 2274 | stable |
| tempestphp/tempest-framework Tempest is a modern, community-driven PHP framework designed to minimize framework-related boilerplate so developers can focus on applicati… | 88 | 2273 | active |
| Dart Frog Dart Frog is a fast, minimalistic backend framework for Dart built on top of shelf and mason, inspired by tools like remix.run, next.js, an… | 87 | 2271 | active |
| xTeVe xTeVe is a self-hosted M3U proxy server written in Go that merges and manages IPTV playlists (M3U) and XMLTV guide data for Plex DVR and Em… | 64 | 2270 | active |
| 8treenet/freedom Freedom is a Go framework built on hexagonal architecture (ports and adapters) that supports domain-driven design with rich domain models. … | 87 | 2269 | active |
| PaperMC/Velocity Velocity is a modern, high-performance Minecraft server proxy written in Java, designed to route players across multiple backend servers wi… | 76 | 2269 | active |
| supabase/supavisor Supavisor is a cloud-native, multi-tenant Postgres connection pooler built in Elixir/Erlang. It proxies millions of client connections into… | 96 | 2266 | active |
| envoyproxy/ai-gateway Envoy AI Gateway is an open-source, Kubernetes-native gateway built on Envoy Gateway that manages traffic from application clients to Gener… | 86 | 2261 | stable |
| monksoul/Furion Furion is a batteries-included application framework for .NET/C# that simplifies building web APIs and enterprise applications with feature… | 91 | 2238 | active |
| AmoyLab/Unla Unla is a lightweight, configuration-driven MCP gateway written in Go that converts existing MCP servers and REST APIs into MCP-compliant e… | 80 | 2236 | active |
| lets-mica/mica Mica is a Java toolkit and set of Spring Boot/Spring Cloud starter components for microservice development, offering utilities, captcha, HT… | 76 | 2236 | active |
| sohutv/mqcloud MQCloud is an enterprise-grade one-stop management platform for Apache RocketMQ, combining client SDK, operations, monitoring, and alerting… | 74 | 2230 | active |
| Enqueue Enqueue is a production-ready messaging solution for PHP that provides a unified API for creating, sending, and reading messages across man… | 86 | 2220 | stable |
| karldoenitz/Tigo Tigo is an HTTP web framework written in Go with a Tornado-like API and better performance. It includes routing, middleware support, and co… | 64 | 2203 | active |
| Ice Ice (Internet Communications Engine) is a complete RPC framework for building networked applications, using the Slice IDL to generate clien… | 92 | 2193 | stable |
| samchon/nestia Nestia is a set of helper libraries for NestJS that turns plain TypeScript types into runtime validation, a typed client SDK, OpenAPI/Swagg… | 93 | 2179 | active |
| HyperHDR HyperHDR is an open-source ambient lighting application that analyzes screen content and audio in real time to drive addressable LED strips… | 88 | 2172 | active |
| Particular/NServiceBus NServiceBus is a .NET messaging framework for building distributed systems and async microservices, providing abstractions over message que… | 96 | 2171 | stable |
| BEpusdt BEpusdt is a self-hosted personal cryptocurrency payment gateway written in Go, forked from Epusdt with additional features. It supports US… | 91 | 2160 | active |
| warpstreamlabs/bento Bento is a high-performance, resilient stream processor written in Go that connects a wide range of sources and sinks (Kafka, Pub/Sub, Redi… | 89 | 2155 | active |
| rynfar/meridian Meridian is a proxy that bridges Anthropic's Claude Agent SDK to the standard Anthropic API format, letting a Claude Max subscription power… | 80 | 2148 | active |
| dotnetcore/WebApiClient WebApiClient is a declarative REST API client library for .NET where developers define HTTP clients by declaring C# interfaces. It supports… | 76 | 2136 | active |
| DingTalk-Real-AI/dingtalk-openclaw-connector The official DingTalk channel plugin for OpenClaw, connecting an OpenClaw AI agent to DingTalk for messaging, documents, calendars, todos, … | 80 | 2131 | active |
| platformatic/platformatic Platformatic Watt is an open-source Node.js application server that runs any Node.js application (in any framework) inside worker threads, … | 96 | 2130 | active |
| apioo/fusio Fusio is a self-hosted, open-source API management platform and gateway written in PHP that turns databases, microservices, and custom logi… | 94 | 2125 | active |
| midday-ai/ai-sdk-tools A monorepo of TypeScript utility packages extending the Vercel AI SDK, including multi-agent orchestration, Zustand-based chat state manage… | 41 | 2097 | active |
| realworld-apps/aspnetcore-realworld-example-app An ASP.NET Core backend implementation of the RealWorld (Medium.com clone) spec, demonstrating CRUD, JWT authentication, pagination, and ve… | 74 | 2089 | active |
| ossia/score ossia score is a free, open-source interactive sequencer for audio-visual artists, designed to create interactive shows, installations, and… | 88 | 2072 | active |
| w2016561536/android_virtual_cam An Xposed module for Android that replaces the camera feed of target apps with a custom video or image. It hooks camera APIs so apps receiv… | 23 | 2068 | active |
| crossbario/crossbar Crossbar.io is an open-source application router implementing the WAMP protocol over WebSocket, plus REST/HTTP and MQTT bridging, for build… | 95 | 2062 | active |
| Simple Admin Simple Admin is a Go-based distributed microservice backend framework built on go-zero, Ent, and Casbin for rapidly building admin manageme… | 94 | 2060 | active |