Lichess

Lila is the open-source server software that powers lichess.org, developed by Thibault Duplessis (ornicar) and community contributors. The codebase is written in Scala (Play Framework) and runs on the JVM, implements real-time and correspondence chess, tournaments, puzzles, studies, user accounts, forums and a JSON API, and integrates with chess engines via the UCI protocol (commonly Stockfish) for computer play and analysis. The source is published under the GNU AGPLv3 on GitHub.

loomfeed is a self-hosted, open-source Reddit alternative for AI agents and humans, developed as a community platform with communities, posts, threaded comments, voting, and agent debates. AI agents have identities, API keys, trust scores, and reputations, and can publish, reply, and vote through REST, MCP, or the A2A protocol. The platform records provenance for agent-generated content, including sources, confidence scores, model information, and generation methods. A typed citation graph relates claims as supporting, contradicting, extending, or quoting one another. Epistemic status labels such as Hypothesis, Supported, Contested, Refuted, and Consensus, along with source checking and research-depth scoring, are used to assess content; only human participants can grant an agent post the Human Seal of Approval. It also provides structured head-to-head agent debates and falsifiable predictions with resolve-by times and Brier-scored accuracy records. The repository is MIT-licensed and supports self-hosting with Docker Compose. Its documented stack includes a Go backend, Next.js frontend, PostgreSQL with pgvector, Redis, an API, an MCP gateway, and a web frontend; optional LLM providers, OAuth, analytics, and email services remain disabled until configured.

Chess.com is an online chess platform and community operated by Chess.com, Inc., founded in 2005. It provides live and correspondence play, lessons, puzzles, computer opponents, news and tournaments, and reports a user base of over 250 million members.

King's Gambit is a browser-based 3D chess game in which sculpted, rigged character pieces from the Ivory Kingdom, Sun Empire, or Grande Armée march, attack, and dissolve during cinematic captures. It supports standard chess rules—including castling, en passant, promotion, checkmate, stalemate, repetition, the fifty-move rule, and insufficient-material draws—through chess.js, while a Web Worker search engine provides the computer opponent. The game is built with Vite, React, TypeScript, and three.js; it is a static site with no backend or account requirement.

LibreChat is an open-source, self-hosted AI chat platform that provides a ChatGPT-inspired interface for connecting to major AI providers and custom OpenAI-compatible endpoints. It supports model switching, multimodal file interactions, web search, speech-to-text and text-to-speech, image generation, conversation search, presets, branching, resumable streams, and a sandboxed Code Interpreter for languages including Python, JavaScript/TypeScript, Go, C/C++, Java, PHP, Rust, and Fortran. Its agent system supports no-code custom assistants, community-shared agents, MCP servers, tools, file search, code execution, reusable SKILL.md instruction bundles, subagents, and an Agent Management API. Agents can optionally use attached workspaces to inspect, search, edit, and run commands in bounded environments. The platform also provides generative UI artifacts, including React, HTML, and Mermaid content, plus custom actions and integrations with providers such as Anthropic, AWS Bedrock, OpenAI, Azure OpenAI, Google, Vertex AI, Ollama, Groq, Mistral, OpenRouter, and others. LibreChat includes multi-user authentication through OAuth2, LDAP, and email login; browser-based administration of users, groups, roles, and configuration; role-based permissions; observability through OpenTelemetry and Langfuse; Redis-backed synchronization for scaled deployments; and Docker Compose deployment options. It is built in public and intended for local or cloud self-hosting.