Ledge is markdown notes that run shell commands, code, SQL and AI prompts in place.. The tools below share its categories (Developer Tools, Open Source, Productivity). Most are still pre-launch, so you are comparing direction and early access rather than finished feature lists.
Biome
LaunchedA fast formatter and linter for JavaScript, TypeScript, JSON and CSS in one tool.
Bun
LaunchedA fast JavaScript runtime, bundler, test runner and package manager in one binary.
Copperhead
LaunchedAn open-source AI engineering platform for designing, verifying and shipping circuit boards.
Drop
LaunchedA rootless Linux sandbox for isolating coding agents and third-party programs.
Excalidraw
LaunchedAn open-source virtual whiteboard for sketching hand-drawn-style diagrams.
M3e Canvas
LaunchedSketch Material 3 Expressive screens in the browser and turn them into vibe-coding prompts.
PCBJam
BetaKiCad in the browser, with real-time collaboration on the same project.
Raycast
LaunchedA keyboard launcher for Mac that replaces Spotlight with extensions, snippets and window management.
rhun
LaunchedA small, fast, open-source code editor for Windows, Linux and macOS, written in assembly.
Spline
LaunchedA browser-based 3D design tool for building interactive scenes for the web.
Vite
LaunchedA frontend build tool with a fast dev server and optimised production builds.
Woxi
LaunchedAn open-source Wolfram Language interpreter written in Rust, with a browser playground.
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