175 listed
Harnesses & SDKs
Frameworks and SDKs for building agents: the Claude Agent SDK, OpenAI Agents SDK, LangGraph, CrewAI and many more. Each page lists languages, packages, MCP and A2A support and how it orchestrates agents, with a link to the page every fact came from.
Showing 1–8 of 8
- 0.778score
AgentScope Java
Alibaba Tongyi Lab
Java framework for distributed, long-running agents with typed event streams, permission gating, middleware and subagents.
HarnessAFreshness: A★ 6.1K - 0.771score
Ax
Ax
DSPy-style toolkit for typed LLM signatures, agents and flows, TypeScript-first with Python, Java, C++, Go and Rust libraries.
HarnessAFreshness: A★ 3K↓ 27.2K/wk - 0.757score
atmosphere
Atmosphere
Java runtime for AI agents that streams tokens and tool events over WebSocket, SSE or gRPC, with human approvals.
HarnessAFreshness: A★ 3.8K - 0.734score
Google Agent Development Kit (ADK)
Google
Open-source toolkit for building, evaluating and deploying agents in Python, TypeScript, Go, Java and Kotlin, tuned for Gemini but model-agnostic.
HarnessAFreshness: A★ 22K↓ 2.4M/wk - 0.700score
Spring AI Alibaba
Alibaba
Java framework for agentic, workflow and multi-agent AI apps, with graph workflows, MCP and A2A support.
HarnessAFreshness: A★ 11.1K - 0.635score
LangGraph4j
LangGraph4j
Java library for stateful, multi-agent LLM applications built as cyclical graphs, designed to work with langchain4j and Spring AI.
HarnessAFreshness: A★ 2.1K - 0.621score
Semantic Kernel
Microsoft
Model-agnostic SDK for building agents and multi-agent systems in Python, .NET and Java; Microsoft names Agent Framework as its successor.
HarnessAFreshness: A★ 28.7K↓ 77.5K/wk - 0.601score
ADK for Java
Google
Code-first Java toolkit for building and testing AI agents, with multi-agent hierarchies, a dev UI and Maven packages.
HarnessAFreshness: A★ 1.8K