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Strongly typed Python A2A library with Pydantic v2, dataclasses, and robust serialization support.

Modular .NET A2A SDK — Core, Client, Server, HTTP + gRPC + JSON-RPC, Redis persistence, Quartz scheduling: assemble only what you need.

Full Java A2A stack - separate Spring Boot client/server starters, BOM, Reactor SSE streaming, spec-faithful A2A 1.0 support, and Maven Central distribution.

Full-stack A2A framework — Python backend + Node.js frontend included, multi-agent coordination with host agent, MCP tools via JSON config, RAG and DeepSearch agents ready to deploy.

Minimal Python A2A implementation covering client and server basics, task lifecycle, streaming, and push updates.

979 stars — the most complete Python A2A framework: workflow engine, AI router, Agent Flow UI drag-and-drop, native LangChain, MCP v2.0 with GitHub/Browserbase/Filesystem providers, full CLI.

Rust MCP client/server crate in active development — ergonomic agentic building blocks, JSON-RPC via rpc-router, multi-AI via genai, A2A on roadmap.

Cognitive architecture on top of Google ADK - 5 specialized agents (Orchestrator, Memory, Narrative, Identity, MCP), persistent memory with embeddings, multi-turn session management, and AIRA network integration.