16 points by swimmingbrain | 0 comments
GitHub repository for braiNOTES, an MIT-licensed browser app for handwritten pen notes and whiteboarding on lecture PDFs, stored locally with no account or backend.
58 points by bepero | 13 comments
GitHub repository for Sumi.css, a minimalist classless-first CSS framework (6.7 KB gzipped) with dark mode, theming via custom properties, and no build step.
38 points by abdullahalharir | 2 comments
GitHub repository for Penmentor, an open-source AI mentor that reads handwritten math and marks it up like a teacher using Claude, Codex, or Antigravity.
474 points by max_lt | 145 comments
Announcement page for OpenWorkers, an open-source Rust runtime for running untrusted JavaScript in V8 isolates as self-hosted Cloudflare Workers.
9 points by bsutto | 3 comments
Show HN post introducing reVault, a Rust-based encrypted, signed, compressed archive format (lockbox) with CLI, keyserver, and multi-language bindings.
![Screenshot of youtube.com: PlayBook: A Programmable Paper Notebook [video]](https://hn.urlbox.com/shots/renders/2026/10/1/95cdc214-bb48-46b8-8bf9-f26bdc71e640.jpg)
26 points by surprisetalk | 5 comments
A YouTube video from Ink & Switch and Local-First Conf presenting PlayBook, a programmable paper notebook.