AI for tool use
Function calling and tool-using LLMs.
| # | Tool | Category | Pricing | Visit |
|---|---|---|---|---|
| 1 | LangChain Open-source LLM application framework — chains, agents, RAG, and 700+ integrations with 127K GitHub stars | LLM Frameworks | Free | Visit |
| 2 | Vercel AI SDK TypeScript AI SDK for React and Node — streaming, tool use, and multi-provider LLM integration with 1M+ npm downloads/week | LLM Frameworks | Free | Visit |
| 3 | LiteLLM Python SDK and proxy to call 100+ LLMs with one interface | LLM Frameworks | Free | Visit |
| 4 | Instructor Structured LLM outputs with Pydantic — type-safe data extraction from any language model | LLM Frameworks | Free | Visit |
| 5 | OpenAI Assistants API Build persistent AI assistants with memory, tools, and file knowledge — no session management needed | Agents | Paid | Visit |
| 6 | Anthropic Python SDK Official Python library for Claude API — access Claude Sonnet 4.6, Haiku 4.5, and Opus 4.6 | LLM Frameworks | Paid | Visit |
| 7 | AWS Bedrock Fully managed foundation model service on AWS — Claude, Llama, Titan, and more | LLM Frameworks | Paid | Visit |