ycombinator

🪢 Open source AI engineering platform: LLM evals, observability, metrics, prompt management, playground, datasets. Integrates with OpenTelemetry, LangChain, OpenAI SDK, LiteLLM, and more. 🍊YC W23

YC (S26) | Open Computer History | Record your screen continuously locally and provide context to your agents (Claude, Codex, Openclaw, Hermes, Runner...)

🧊 Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 🍓

Build and generate PDF using React 📄 UI kit for PDFs and print documents. Simple, reusable components and templates to create great invoices, docs, brochures. Use your favorite front-end framework React to build your next PDF.

🌿 It's Hacker News in your terminal

🔒 Enterprise-grade API gateway that helps you monitor and impose cost or rate limits per API key. Get fine-grained access control and monitoring per user, application, or environment. Supports OpenAI, Azure OpenAI, Anthropic, vLLM, and open-source LLMs.

📚 Download the full collection of Paul Graham essays in EPUB, PDF & Markdown for easy reading.

PostgreSQL vector database extension for building AI applications

✨ Hacker News, but refined — Interface tweaks and features to make the HN experience better

The iPhone version of News/YC, a Hacker News reader and interactive iOS application.

EdgeChains.js is Full-Stack GenAI library. Front-end, backend, apis, prompt management, distributed computing. All core prompts & chains are managed declaratively in jsonnet (and not hidden in classes)

Find the perfect open source project to contribute

Curated collection of AI dev tools from YC companies, aiming to serve as a reliable starting point for LLM/ML developers

The open-source company brain. Run your entire company with AI agents, skills, and a self-improving context.

Displays top stories from Hacker News inside Obsidian.

The Brain Of Your B2B SaaS. A better way to unify your customers' data and get meaningful insights out of the box. Built on Next.js, Ruby on Rails, Tailwind, Shadcn, and more. Backed by Y Combinator - YC W23

Modular, open source LLMOps stack that separates concerns: LiteLLM unifies LLM APIs, manages routing and cost controls, and ensures high-availability, while Langfuse focuses on detailed observability, prompt versioning, and performance evaluations.

✌️Y Combinator directory scraper

Lambda Calculus things implemented on Python

Create WOW Moments. Create superfans.