A2a projects on GitHub

Agent-to-Agent protocol for interoperable communication between AI agents.

As of October 17, 2026, the most-starred A2a projects on GitHub are OmniRoute (77.4K stars), A2A (26.2K stars) and casdoor (14.6K stars). GitHub.Locker tracks 20 A2a repositories with 182.1K stars combined. The fastest-growing on October 16 was OmniRoute, with +356 stars in a day.

20Projects

182.1KStars in total

+488Stars in a day

Browse in the catalog →github.com/topics/a2a ↗

Hot right now

Most stars gained in a day · Oct 16

+356

OmniRoute

diegosouzapw/OmniRoute · ★ 77.4K

OmniRoute is a free, open-source AI gateway that puts 359 providers and 1200+ models (Kimi, Claude, GPT, Gemini, GLM, DeepSeek, MiniMax, etc.) behind one API endpoint, with quota-aware automatic fallback when a provider runs out.

+39

agent-native

BuilderIO/agent-native · ★ 7.4K

Agent-Native is an open-source TypeScript framework for building agentic apps: each capability is defined once as an 'action' that an AI agent can call as a tool and the UI can call directly in code, sharing data, permissions and state between them.

+25

ai-agents-from-zero

didilili/ai-agents-from-zero · ★ 5.4K

This is a comprehensive, long-term-maintained AI Agent / LLM application development tutorial in Chinese, covering everything from basic concepts to enterprise-grade deployment, with runnable projects and an interview question bank.

+14

agentic-design-patterns

xindoo/agentic-design-patterns · ★ 8.3K

A Chinese translation project of the book 'Agentic Design Patterns' by Google, covering 21 core design patterns for building AI agent systems plus several appendices.

The all-time top

20 projects · by stars

#1 · diegosouzapw/OmniRoute
OmniRoute
OmniRoute is a free, open-source AI gateway that puts 359 providers and 1200+ models (Kimi, Claude, GPT, Gemini, GLM, DeepSeek, MiniMax, etc.) behind one API endpoint, with quota-aware automatic fallback when a provider runs out.
77.4K
#2 · a2aproject/A2A
A2A
The Agent2Agent (A2A) protocol is an open standard that lets gen AI agents built on different frameworks and run by different companies talk to each other — discovering capabilities, negotiating how to interact, and collaborating on long-running tasks as agents, not just as tools.
26.2K
#3 · casdoor/casdoor
casdoor
Casdoor is an open-source, self-hosted identity and access management (IAM) platform: a single sign-on (SSO) and authentication server with a web console that speaks OAuth 2.0, OIDC, SAML 2.0, CAS, LDAP, SCIM 2.0, WebAuthn, TOTP/MFA, and MCP, and connects to providers like Google Workspace and Azure AD.
14.6K

4
spring-ai-alibaba
11Kalibaba/spring-ai-alibaba · Java
Spring AI Alibaba is a production-ready Java framework for building agentic, workflow, and multi-agent applications, built on top of Spring AI.
5
evolver
8.7KEvoMap/evolver · JavaScript
Evolver is a self-evolution engine for AI agents. It reads an agent's runtime logs and signals, distills them into auditable, reusable evolution assets called Genes and Capsules, and emits a protocol-bound GEP prompt that guides the agent's next step.
6
agentic-design-patterns
8.3Kxindoo/agentic-design-patterns · HTML
A Chinese translation project of the book 'Agentic Design Patterns' by Google, covering 21 core design patterns for building AI agent systems plus several appendices.
7
agent-native
7.4KBuilderIO/agent-native · TypeScript
Agent-Native is an open-source TypeScript framework for building agentic apps: each capability is defined once as an 'action' that an AI agent can call as a tool and the UI can call directly in code, sharing data, permissions and state between them.
8
internet-court-skill
6.7Kinternet-court/internet-court-skill · TypeScript
Internet Court is an open Agent Skill that lets AI agents negotiate, pay, and resolve disputes with each other without a human in the loop, by connecting fragmented web3 commerce standards and adding the dispute-resolution layer none of them provide.
9
ai-agents-from-zero
5.4Kdidilili/ai-agents-from-zero · Python
This is a comprehensive, long-term-maintained AI Agent / LLM application development tutorial in Chinese, covering everything from basic concepts to enterprise-grade deployment, with runnable projects and an interview question bank.
10
Observal
4.5KObserval/Observal · Python
Observal is a self-hosted control plane and registry for internal AI components, letting teams package, discover, and share Skills, MCP servers, and Agents with built-in usage insights.
11
sprix-sage-router
3.6Kwang2122/sprix-sage-router · Python
SAGE is a research decision layer that sits above the A2A (Agent2Agent) protocol and decides, mid-execution, whether an in-flight task should stay with the current agent (SELF), recruit helpers (COLLABORATE), or be fully handed off to a specialist peer (HANDOFF), based on completed work, artifact reuse, observed quality, budget, and deadline.
12
ai-agents-the-definitive-guide
2.8KNicolepcx/ai-agents-the-definitive-guide · Jupyter Notebook
It is the companion code repository for the book 'AI Agents - The Definitive Guide': a set of runnable Jupyter notebooks that walk through every chapter, from basic agent patterns to production deployment and threat modeling.
13
Agentlas-OS
1.6Kagentlas-ai/Agentlas-OS · Python
Agentlas OS keeps a pool of specialist AI agents in a hub and spins up a temporary orchestrator for each task, splitting work and staffing specialists pulled from your machine, your private cloud, and a public Hub. It is local-first and works with any model, running inside hosts like Claude Code, Codex, Cursor and Gemini.
14
nautilus-compass
1.3Kchunxiaoxx/nautilus-compass · Python
nautilus-compass is an open-source memory and reliability layer for AI coding agents: it gives them long-term memory, catches cases where the agent ignores recalled rules (drift detection), and ships its own benchmark suite to verify the claims independently.
15
ai-system-design
672amitshekhariitbhu/ai-system-design · Markdown
A free, open-source guide that teaches AI System Design step by step: how to combine GPUs, inference servers, caches, vector databases, AI agents, guardrails, and evals into one system that is fast, cheap, reliable, and safe.
16
smythos-studio
649SmythOS/smythos-studio · TypeScript
SmythOS Studio is an open-source visual builder for creating and deploying AI agents, where you drag and drop components to assemble agent workflows instead of writing code from scratch.
17
Paxeer-X-Network
571Sidiora-Labs/Paxeer-X-Network · Rust
LayerX Network is a deterministic execution and accounting network for autonomous agents: every state-changing action enters as a signed, canonically encoded Activity that gets ordered, applied deterministically, and returned as a signed receipt, with periodic settlement to the Paxeer Network.
18
multi-agent
490phoenix-zhou/multi-agent · Python
This is a multi-agent travel assistant that uses the Agent2Agent (A2A) protocol and the Model Context Protocol (MCP) so specialized agents can work together on weather lookups, train/flight/concert ticket queries, ticket booking, and attraction recommendations.
19
busbar
194GetBusbar/busbar · Rust
Busbar is a self-hosted execution control plane that sits between AI applications and the AI providers they call, letting operators verify, govern, route, and record every model request, MCP tool call, and A2A agent delegation before it reaches its destination.
20
technocore-chat
165flop-labs/technocore-chat · Python
technocore-chat is a zero-auth chat and notes service built specifically for AI agents whose sandboxes only allow fetching URLs: every operation, including writes, is a single plain GET request. It runs live at technocore.chat and can also be self-hosted.