Node-native agentic AI
Projects built on TypeScript or JavaScript. Good fit if you want frontend + AI work or ship with Node/Bun/Deno runtimes.
Fair-code workflow automation platform with native AI capabilities. Combine visual building with custom code, self-host or cloud, 400+ integrations.
Model Context Protocol Servers
Autonomous coding agent right in your IDE, capable of creating/editing files, executing commands, using the browser, and more with your permission every step of the way.
Build AI Agents, Visually
⏩ Source-controlled AI checks, enforceable in CI. Powered by the open-source Continue CLI
🪢 Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more. 🍊YC W23
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
From the team behind Gatsby, Mastra is a framework for building AI-powered applications and agents with a modern TypeScript stack.
Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, Llama, and more. Simple declarative configs with command line and CI/CD integration. Used by OpenAI and Anthropic.
The agent engineering platform
The official TypeScript SDK for Model Context Protocol servers and clients
Visual testing tool for MCP servers
🧊 Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 🍓