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Gradual, multilingual textual programming for the classroom

An open-source note app for linked ideas, personal knowledge graphs, and self-hosted knowledge bases.

A Windows reader for PDFs, ebooks, and comics

A free Android activity log with route maps, pace charts and no ads

A specialized source collection for file-type and technology symbols.

PDF content and page editing with browser and desktop routes

PDF review with split view, comparison, and forms

Change PDF text and replace images on desktop

An open-source Android companion for supported watches, bands and other devices

An open-source desktop reading and annotation app

Consumer VPN with published app source and unlimited connections

Build a wiki from linked pages, namespaces, and a dedicated open-source engine.