What are the most powerful underground AI tools that no one talks about enough?

Most powerful AI/agent tools nobody talks about, and it leaves you behind IMO **1. Instructor** define a Pydantic model, get clean structured JSON out of any LLM every time → [https://github.com/567-labs/instructor](https://github.com/567-labs/instructor) **2. Octopoda** gives any AI agent persistent memory and catches it when it loops and quietly burns your tokens. open source → [https://www.octopodas.com](https://www.octopodas.com) **3. E2B** secure cloud sandboxes so your agent can actually run the code it writes without nuking your machine → [https://e2b.dev](https://e2b.dev) **4. Firecrawl** turn any website into clean, LLM-ready markdown in one API call → [https://firecrawl.dev](https://firecrawl.dev) **5. Composio** plug your agent into 1000+ apps (Gmail, Slack, GitHub) with the auth handled for you → [https://composio.dev](https://composio.dev) **6. LiteLLM** one API for 100+ models across OpenAI, Anthropic and local, swap without rewriting a line → [https://github.com/BerriAI/litellm](https://github.com/BerriAI/litellm) what are yours, let me know and I will add it to the list next month!