2,002 offers
Free Tool & Function Kits — ranked by value
Tool/function libraries for agents
Scores rate free-tier value on a 1–10 scale. How scores work →
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LangChain Tool & Function Kits 8.4 The agent engineering platform. 140.9k★707/90d8 devs/90d -
Open Interpreter Tool & Function Kits 8.2 A lightweight coding agent for open models like Deepseek, Kimi, and Qwen 64.3k★2.6k/90d30 devs/90d -
Agno Tool & Function Kits 8.0 Build, run, and manage agent platforms. 41k★426/90d45 devs/90d -
Vercel AI SDK Tool & Function Kits 7.9 The AI Toolkit for TypeScript. From the creators of Next.js, the AI SDK is a free open-source library for building AI-powered applications and agents 25.3k★952/90d23 devs/90d -
LlamaHub (LlamaIndex tools) Tool & Function Kits 7.8 LlamaIndex is the leading document agent and OCR platform 50.6k★129/90d47 devs/90d -
PydanticAI Tool & Function Kits 7.6 AI Agent Framework, the Pydantic way 18.2k★448/90d48 devs/90d -
CAMEL Tool & Function Kits 7.3 🐫 CAMEL: The first and the best multi-agent framework. Finding the Scaling Law of Agents. https://www.camel-ai.org 17.3k★85/90d30 devs/90d -
E2B Tool & Function Kits 7.1 Open-source, secure environment with real-world tools for enterprise-grade agents. 12.8k★167/90d11 devs/90d -
Toolformer-style Hugging Face smolagents tools Tool & Function Kits 6.3 🤗 smolagents: a barebones library for agents that think in code. 28.2k★13/90d7 devs/90d -
Steel Web Agents Toolkit Tool & Function Kits 6.1 🔥 Open Source Browser API for AI Agents & Apps. Steel Browser is a batteries-included browser sandbox that lets you automate the web without worrying about infrastructure. 7.3k★16/90d7 devs/90d -
AutoGen Tools Tool & Function Kits 6.0 A programming framework for agentic AI 59.5k★1/90d1 devs/90d -
ACI.dev Tool & Function Kits 5.6 ACI.dev is the open source tool-calling platform that hooks up 600+ tools into any agentic IDE or custom AI agent through direct function calling or a unified MCP server. The birthplace of VibeOps. 4.8k★22/90d3 devs/90d -
Arcade Tool & Function Kits 5.6 MCP Server Framework and Tool Development library for building custom capabilities into agents. 947★46/90d9 devs/90d -
Zapier MCP / NLA Tool & Function Kits 5.6 The toolkit for you to build an integration on Zapier 533★90/90d10 devs/90d -
Klavis AI Tool & Function Kits 5.5 Klavis AI: MCP integration platforms that let AI agents use tools reliably at any scale 5.8k★17/90d3 devs/90d -
MCP Agent Tool & Function Kits 4.6 Build effective agents using Model Context Protocol and simple workflow patterns 8.4k★0/90d0 devs/90d -
Inngest AgentKit Tool & Function Kits 4.5 AgentKit: Build multi-agent networks in TypeScript with deterministic routing and rich tooling via MCP. 910★3/90d1 devs/90d -
CrewAI Tools Tool & Function Kits 3.8 Extend the capabilities of your CrewAI agents with Tools 1.5k★0/90d0 devs/90d -
Toolkit catalog (GetStream ai-agent-tools-catalog) Tool & Function Kits 2.6 Explore the must-have external ready-made toolkits to integrate with your AI agents built with Python and TypeScript 123★0/90d0 devs/90d -
Smithery Tool & Function Kits 2.6 The fastest way to extend your AI. 0★0/90d0 devs/90d -
Composio Rube Tool & Function Kits 2.6 Universal MCP server built on Composio that connects AI tools to 500+ apps like Gmail, Slack, GitHub, and Notion through a single endpoint. GitHub -
Toolhouse Tool & Function Kits 2.6 Backend-as-a-service for AI agents that lets developers equip LLMs with cloud-hosted tools such as code execution, web search, and email through a single SDK call. GitHub