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MIT-licensed Python linter and formatter written in Rust, from Astral and already a default across much of the ecosystem for its speed. The v0.16.0 release expands the defaults dramatically, with the recommended rule set jumping from 59 to 413 rules so a fresh install catches far more out of the box without extra configuration. Free and open source; Astral funds the work through its paid registry and the uv toolchain rather than the linter itself. 48.9k stars
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MIT-licensed multimedia sketchpad by John Earnest that builds openly on the legacy of HyperCard and the classic Mac creativity tools. It bundles a paint program, hypertext linking and a small scripting language into one app for making and sharing interactive documents, decks and small toys that run anywhere, with no account or cloud involved. Free and open source. 1.6k stars
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MIT-licensed presentation tool that fits an entire slide deck, editor and all, into a single HTML file of around 560KB. Open it in any browser to edit, present, print and save with no install and no login, and it keeps working fully offline, with the slide data stored as plain JSON near the top of the file. Live collaboration runs through an encrypted blind relay that never sees your content, and you can hand an existing PowerPoint to an AI assistant to convert it into a deck. Built on reveal.js by its creator, free. 2.4k stars
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Free plain-text weather site for anywhere in the world, built by jsax as an at-a-glance alternative after the UK Met Office redesigned its site into something busier. It lays out a seven-day outlook, a previous-day comparison and hourly rain, wind, temperature, UV, air quality and pollen as dense character-based visualisations in one scrollable column that works well on a phone. Every view, down to the selected day and which sections are expanded, lives in the URL, so you can share or bookmark an exact forecast. Built in Go on PocketBase with weather data from Open-Meteo, with no accounts and no paid tier.
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GPL-3.0 native macOS video editor from Palmier, built for an AI-assisted editing workflow and running locally on the Mac. The full source is open for you to build and run yourself. Free and open source. 12.5k stars
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Free, local-first speed reader that runs entirely in your browser, made by SamuraiLion. It flashes text one word at a time in a fixed spot, the RSVP technique, to strip out the eye movement of ordinary reading, and it opens your own files by bundling PDF, EPUB and .docx converters so nothing has to leave your machine. No account, no cloud and no paid tier.
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Open-source Airtable alternative from Teable, Inc. that turns spreadsheet-style tables into databases, internal apps and AI-driven workflows, launched here at version 3.0. The core backend and web app are AGPL-3.0, with some surrounding components under separate commercial terms that fund the hosted service. Self-hosting the community edition is free, while Teable Cloud runs from a free tier up to $10 and $20 per seat a month billed annually. 21.5k stars
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MIT-licensed website cloner from ion.design that deterministically turns any live site into clean, componentised Next.js or Vite source code, rather than a screenshot or a tangle of scraped markup. Entirely free with no paid tier, so you either run it yourself or use the free hosted API. 1.1k stars
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Native macOS notes app from Demian Turner that keeps everything as plain local Markdown files in an ordinary folder, with no database and no account, so your notes stay readable even outside the app. It covers projects, journals, tags, fast search and automatic image organisation, works fully offline, and syncs through iCloud Drive only if you point it at an iCloud folder. Closed-source and free to download with every feature unlocked for a 14-day trial; after that notes drop to read-only unless you buy Pro, which is $2.99/mo, $19.99/yr or a one-time $49.99 for lifetime.
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MIT-licensed zsh add-on by Giammarco Ferranti that predicts the next command you are likely to type, going a step beyond completing the one you have already started. It runs as a small Go daemon with no TUI and no cloud sync, learning locally from your own shell history. Free and open source with no donation prompts. 317 stars
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AGPL-3.0 local-first GTD task manager for desktop, mobile and web, by dongdongbh. Your tasks stay on the device with no account required, and an optional self-hosted Docker sync server keeps them in step across machines without any vendor cloud in the middle. Free, funded through GitHub Sponsors and Ko-fi. 1.5k stars
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AGPL-3.0 self-hosted dashboard for your sports and fitness data, by Robin Ingelbrecht. Formerly Statistics for Strava, the v5.0 release cuts the Strava dependency entirely, so you upload raw FIT, TCX and GPX files and manage everything through a built-in admin panel, keeping your training history off any third-party account. Free and self-hosted, funded through GitHub Sponsors and Buy Me a Coffee. 1.9k stars