md2hd

Hubble.md is a free, open-source Markdown and HTML note-taking app for people and AI agents. It provides a Notion- or Apple Notes-style editor with Markdown shortcuts, slash commands, and frontmatter properties, while allowing an agent to work directly with the notes folder; edits made by an agent are live-reloaded in Hubble. Beyond Markdown notes, Hubble can display HTML-based apps built from a notes folder, including views such as tables, bookshelves, and maps. It is distributed as an Electron desktop app for macOS, Windows, and Linux, and the repository also contains a web app, Markdown editor packages, an HTML-app runtime, a filesystem sync engine, and a `hubble` command-line interface.

markdown-graphs is a collection of React components for ASCII-style tables, charts, and diagrams in MDX. It provides more than 30 graph components, including tables, bar charts, sparklines, heat maps, Gantt charts, timelines, trees, and flow diagrams. Components render inside dashed frames using text glyphs and blocks rather than SVG, with optional single-, dual-, or three-accent palettes. The project distributes source files through a shadcn registry: users can add individual components or the full collection to an existing shadcn project, then import them locally. It is not an npm package and requires an existing shadcn project and Motion. The repository is licensed under MIT.

QMD is an on-device command-line search engine for Markdown notes, meeting transcripts, documentation, knowledge bases, and other organized information. It combines BM25 full-text search, vector semantic search, and LLM reranking locally through node-llama-cpp and GGUF models. Its hybrid query pipeline expands the original query into lexical, vector, and HyDE variants, routes them to keyword or vector search, combines the results with Reciprocal Rank Fusion, and applies an LLM reranker to produce final ranked results. Collections can be indexed and enriched with hierarchical context; documents can be retrieved individually or in batches, and JSON and file-oriented output formats support agent workflows. QMD also exposes query, retrieval, batch retrieval, and index-status operations through an MCP server.

Obsidian is a note-taking and personal knowledge management application by Obsidian.md that stores notes as local Markdown files. It provides features for linking notes (backlinks), a graph view, and a plugin system for extensibility across desktop and mobile.