This note collects tools for architecture diagrams, database diagrams, and Mermaid rendering. Crow's foot notation is kept as a reference image. The Excalidraw repository and the mingrammer diagrams repository are listed as links. LikeC4 is an architecture-as-code modeling language and tooling that generates live C4-style diagrams from code. Pele is a small synchronous Mermaid-to-SVG renderer with no runtime dependencies and CSS-variable theming, by kepano (Obsidian). Ondine is a Rust compiler that turns Mermaid into SVG ahead of time. It offers a CLI, a Vite plugin for .mmd files, remark, and opt-in WASM. DrawDB sits under the database heading.
Crow's Foot Notation
Diagram Tools
- https://github.com/excalidraw/excalidraw
- https://github.com/mingrammer/diagrams
- https://github.com/likec4/likec4 — Architecture-as-code modeling language and tooling to generate live C4-style diagrams from code.
- https://github.com/obsidianmd/pele — Pele: small, synchronous Mermaid-to-SVG renderer with no runtime dependencies and CSS-variable theming, by kepano (Obsidian); MIT, 1.8.0 (2026-10-20), targets Mermaid 12.1.0 syntax with its own layout. See Pele.
- https://github.com/wevm/ondine — Ondine: Rust compiler that turns Mermaid into SVG ahead of time (CLI, Vite plugin for .mmd, remark, opt-in WASM). MIT on main (weth, LLC, portions ported from Pele), npm 0.0.3, created 2026-10-18, 371 stars on 2026-10-23. See Ondine.
Database
See also: Online Tools · Developer Tools And Environments