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A local-first knowledge notebook that combines text, handwriting, boards, and linked notes.

An open-source iPad notebook for Apple Pencil writing and PDF markup.

Teach with an infinite, persistent whiteboard integrated into a virtual classroom.

Bitcoin offers with negotiated payments and multisignature escrow

An open-source desktop notebook for stylus handwriting, PDF markup, layers, and audio notes.

A cross-platform TeX editor that keeps source editing and PDF preview in one typesetting workspace.

Audio conversion with effects and filters

Audio conversion, disc extraction, and console workflows

Preset-based media conversion with adjustable encoder settings

Online PDF conversion with a Windows OCR companion

Use a Git repository as a wiki that can be edited in a browser or a text editor.

Put a screenshot in a browser or phone frame with a chosen background.

A lightweight programmer's editor for website files, scripts, and source code.

Read source and text files in the terminal with syntax highlighting and Git-aware display.

Sketch, write, and collaborate on an infinite canvas across touchscreens and other devices.

Check page markup, links, redirects and language references in your browser.

Practical setup, knowledge and examples for accessible interfaces

A submission backend for websites using their own HTML forms

Product and inventory sharing between Shopify shops

Crypto purchases with quote controls and consolidated portfolio activity

Lead-to-deal conversion that carries communication into a linked sales record

Render architectural scenes and collect feedback through linked cloud presentations

A developer SDK for embedding a real-time, collaborative whiteboard into web, mobile, and desktop applications.

A handwriting notebook with note-linked audio, handwriting recognition, and PDF annotation.