OPEN SOURCE picks

Best picks whose code is public, so anyone can check it, run it or keep it alive. 134 picks.

That one website that makes images smaller without wrecking them Squoosh squoosh.app FreeNo signup That one website that works just like old-school MS Paint JS Paint jspaint.app FreeNo signup That one website that finds free, openly licensed images and art you can reuse Openverse openverse.org FreeNo signup That one website that lets you sketch diagrams on a whiteboard Excalidraw excalidraw.com FreeNo signup That one website that shrinks SVG files without breaking them SVGOMG jakearchibald.github.io FreeNo signup That one website that draws and edits vector graphics in your browser Graphite editor.graphite.art FreeNo signup That one website that makes pixel art and animated sprites Piskel piskelapp.com FreeNo signup That one website that makes abstract backgrounds and wallpapers FLUID fluid.krackeddevs.com FreeNo signup That one website that does 3D CAD modeling right in your browser Chili3D chili3d.com FreeNo signup That one website that makes seamless repeating patterns Pattern Monster pattern.monster Free tierNo signup That one website that runs an AI chatbot entirely on your own computer WebLLM Chat chat.webllm.ai FreeNo signup That one website that restores old, blurry photos of faces CodeFormer huggingface.co FreeNo signup That one website that turns a recording into text without uploading it anywhere Whisper Web huggingface.co FreeNo signup That one website that shows how ChatGPT-style AI works on the inside Transformer Explainer poloclub.github.io FreeNo signup That one website that teaches you how to write better AI prompts Prompt Engineering Guide promptingguide.ai FreeNo signup That one website that turns a GitHub project into one text file you can paste into an AI Gitingest gitingest.com FreeNo signup That one website that lets an AI write and fix code for you right from your terminal OpenCode opencode.ai FreeSignup optionalApp download That one website that makes AI images on your own computer for free, with no credits or sign-up ComfyUI comfy.org FreeNo signupApp download That one website that turns a PDF, Word file or slide deck into clean Markdown for AI MarkItDown github.com FreeNo signupApp download That one website that lets an AI browse and click around websites for you Browser Use browser-use.com Free tierSignup optional That one website that gives your AI assistant a memory that lasts between chats Mem0 mem0.ai Free tierSignup required That one website that lets an AI take apart an app to show how it works REA rea.tools FreeNo signup That one website that edits videos on a real timeline, right in your browser OpenReel Video openreel.video FreeNo signup That one website that lets you record and produce music in your browser openDAW opendaw.studio FreeNo signup That one website that lets you make beats on a drum machine Drumhaus drumha.us FreeNo signup That one website that fixes out-of-sync subtitles and edits subtitle files Subtitle Edit Online nikse.dk FreeNo signup That one website that writes sheet music and plays it back MuseScore Studio musescore.org FreeNo signupApp download That one website that turns a recording of an instrument into MIDI Basic Pitch basicpitch.spotify.com FreeNo signup That one website that makes retro 8-bit sound effects for games and videos jsfxr sfxr.me Free tierNo signup That one website that saves a video or sound from TikTok, Instagram and other social sites cobalt cobalt.tools FreeNo signup That one website that sends files between your phone and computer PairDrop pairdrop.net FreeNo signup That one website that shares a note that self-destructs after it's read Onetime Secret onetimesecret.com Free tierSignup optional That one website that pastes text or code and gives you a link to share PrivateBin privatebin.net FreeNo signup That one website that opens KiCad circuit board files without installing KiCad KiCanvas kicanvas.org FreeNo signup That one website that opens and edits AutoCAD DWG files for free Open CAD Studio opencadstudio.com FreeNo signup That one website that shows what's filling up your hard drive WinDirStat windirstat.net FreeNo signupApp download That one website that copies files between an Android phone and a Mac over USB Droid File Transfer droidfiletransfer.com FreeNo signup That one website that keeps folders in sync between your devices with no cloud Syncthing syncthing.net FreeNo signup That one website that gets back files you deleted by accident PhotoRec cgsecurity.org FreeNo signupApp download That one website that opens a 3D model file without installing any software Online 3D Viewer 3dviewer.net FreeNo signup That one website that converts documents between Markdown, Word, HTML and more Try Pandoc pandoc.org FreeNo signup That one website that opens and reads EPUB ebooks right in your browser Readest web.readest.com Free tierSignup optional That one website that sends a document for other people to sign online DocuSeal docuseal.com Free tierSignup required That one website that edits and merges PDFs without uploading them anywhere BentoPDF bentopdf.com FreeNo signup That one website that pulls a table out of a PDF and into Excel Tabula tabula.technology FreeNo signupApp download That one website that splits a PDF or pulls out just the pages you need PDFsam pdfsam.org FreeNo signupApp download That one website that checks your grammar LanguageTool languagetool.org Free tierSignup optional That one website that lets you write Markdown and see it formatted as you type Dillinger dillinger.io FreeNo signup That one website that turns a few lines of text into a flowchart Mermaid Live Editor mermaid.live FreeNo signup That one website that formats your citations and bibliography in APA, MLA or Chicago ZoteroBib zbib.org FreeNo signup That one website that writes LaTeX papers and math documents in your browser Overleaf overleaf.com Free tierSignup required That one website that keeps all your research sources organized and cites them for you Zotero zotero.org Free tierSignup optionalApp download That one website that makes a good-looking resume for free Reactive Resume rxresu.me FreeSignup required That one website that makes a spreadsheet anyone can edit from a link, no account needed EtherCalc ethercalc.net FreeNo signup That one website that turns a spreadsheet into a simple database, like Airtable Grist docs.getgrist.com Free tierSignup optional That one website that gives you a plain notepad in your browser that saves as you type Notepad notepad.js.org FreeNo signup That one website that keeps notes that link to each other, like a second brain Logseq logseq.com Free tierNo signup That one website that prints address labels from a list Free Label Maker blondfrogs.github.io FreeNo signup That one website that hosts a video call without anyone needing an account Jitsi Meet meet.jit.si FreeNo signup That one website that lets a group type in the same document at once, no accounts needed Riseup Pad pad.riseup.net FreeNo signup That one website that prepares you for a software engineering job interview Tech Interview Handbook techinterviewhandbook.org FreeNo signup That one website that splits shared expenses with friends Spliit spliit.app FreeNo signup That one website that helps you make a budget and actually stick to it Actual Budget actualbudget.org FreeNo signupApp download That one website that plans a bike route and exports it as a GPX file BRouter-web brouter.de FreeNo signup That one website that adds up the weight of everything in your pack so you can pack lighter LighterPack lighterpack.com FreeSignup required That one website that shows what is really in a packaged food and how healthy it scores Open Food Facts world.openfoodfacts.org FreeSignup optional That one website that makes beautiful screenshots of code Carbon carbon.now.sh FreeNo signup That one website that tests an API without installing anything Hoppscotch hoppscotch.io FreeSignup optional That one website that draws a database diagram and writes the SQL for you drawDB drawdb.app Free tierSignup optional That one website that lets you use VS Code in a browser tab Visual Studio Code for the Web vscode.dev FreeSignup optional That one website that has dozens of handy little tools for developers in one place IT-Tools it-tools.tech FreeNo signup That one website that decodes Base64 and other scrambled-looking text CyberChef gchq.github.io FreeNo signup That one website that lets you design a PDF template and fill it from code pdfme Playground playground.pdfme.com FreeNo signup That one website that runs a full checkup on any website Web Check web-check.xyz FreeNo signup That one website that checks if a website loads from other countries Globalping globalping.io FreeNo signup That one website that helps you pick a license for your project Choose a License choosealicense.com FreeNo signup That one website that gives you a quick tour of any programming language in one page Learn X in Y Minutes learnxinyminutes.com FreeNo signup That one website that tidies up messy or squashed code so you can read it Beautifier.io beautifier.io FreeNo signup That one website that puts the documentation for every language and framework in one fast search box DevDocs devdocs.io FreeNo signup That one website that teaches you Git by letting you play with branches on a visual diagram Learn Git Branching learngitbranching.js.org FreeNo signup That one website that teaches you CSS flexbox by playing a little game with frogs Flexbox Froggy flexboxfroggy.com FreeNo signup That one website that shows how much an npm package will weigh down your site before you install it Bundlephobia bundlephobia.com FreeNo signup That one website that gives you a free fake REST API to test your app against JSONPlaceholder jsonplaceholder.typicode.com FreeNo signup That one website that tells you which email apps support the HTML and CSS you want to use Can I Email caniemail.com FreeNo signup That one website that gives you free ready-made buttons, forms and menus to copy into a React website shadcn/ui ui.shadcn.com FreeNo signup That one website that has free animated effects and components that make a website feel alive Magic UI magicui.design FreeNo signup That one website that has thousands of free buttons, loaders and cards you can copy and paste Uiverse uiverse.io FreeSignup optional That one website that gives your website Apple's see-through liquid glass look Liquid Glass glass.samasante.com FreeNo signup That one website that adds a good-looking interactive map to your own website mapcn mapcn.dev FreeNo signup That one website that animates anything on a web page with a few lines of JavaScript Anime.js animejs.com FreeNo signup That one website that checks your developer computer for compromised packages and extensions Bumblebee github.com FreeNo signupApp download That one website that finds a free API for almost anything Public APIs github.com FreeNo signup That one website that gives you short, practical code snippets and tips you can copy 30 Seconds of Code 30secondsofcode.org FreeNo signup That one website that gives you a ready-made .gitignore file for your project GitHub gitignore templates github.com FreeNo signup That one website that gives you free animated buttons you can add to a React site with one command Evil Buttons evilbuttons.com FreeNo signup That one website that makes strong passwords Bitwarden Password Generator bitwarden.com FreeNo signup That one website that makes a strong passphrase you can actually remember Diceware Password Generator diceware.dmuth.org FreeNo signup That one website that lets you write and share documents with end-to-end encryption CryptPad cryptpad.fr Free tierSignup optional That one website that hides your real email address behind forwarding aliases SimpleLogin simplelogin.io Free tierSignup required That one website that shows which trackers are hidden in an Android app Exodus Privacy reports.exodus-privacy.eu.org FreeNo signup That one website that shows which sites let you turn on two-factor login 2FA Directory 2fa.directory FreeNo signup That one website that locks your files with encryption before they go to the cloud Cryptomator cryptomator.org Free tierNo signupApp download That one website that suggests privacy-friendly alternatives to the apps you use Privacy Guides privacyguides.org FreeNo signup That one website that gives you a private, encrypted email account Proton Mail proton.me Free tierSignup required That one website that tests if your ad blocker is actually blocking anything Turtlecute Ad Block Test adblock.turtlecute.org FreeNo signup That one website that maps the license plate cameras near you DeFlock deflock.org FreeNo signup That one website that finds free apps you can run on your own server instead of paying for a subscription Awesome-Selfhosted awesome-selfhosted.net FreeNo signup That one website that shows the night sky from where you are Stellarium Web stellarium-web.org FreeNo signup That one website that lets you play with science simulations PhET Interactive Simulations phet.colorado.edu FreeNo signup That one website that plays MIDI files as falling piano notes you can learn from midee midee.app FreeNo signup That one website that shows how your code runs, one step at a time Python Tutor pythontutor.com FreeNo signup That one website that simulates electronic circuits Falstad Circuit Simulator falstad.com FreeNo signup That one website that teaches you to code from scratch for free freeCodeCamp freecodecamp.org FreeSignup optional That one website that shows charts and data on how the world is changing Our World in Data ourworldindata.org FreeNo signup That one website that lets you help real scientists from your couch Zooniverse zooniverse.org FreeSignup optional That one website that makes flashcards that quiz you right before you'd forget Anki apps.ankiweb.net Free tierNo signupApp download That one website that shows every satellite and piece of space junk orbiting Earth, live in 3D KeepTrack app.keeptrack.space FreeSignup optional That one website that shows real example sentences with translations to learn how a word is used Tatoeba tatoeba.org FreeSignup optional That one website that walks you through building your own database, game or even Git from scratch Build Your Own X github.com FreeNo signup That one website that lists free programming books, courses and cheat sheets for any language Free Programming Books ebookfoundation.github.io FreeNo signup That one website that teaches you how big websites are built to handle millions of users System Design Primer github.com FreeNo signup That one website that lets you play chess online for free, with no ads Lichess lichess.org FreeSignup optional That one website that lets you play dozens of logic puzzles with no ads Simon Tatham's Puzzle Collection chiark.greenend.org.uk FreeNo signup That one website that plays old Windows games right in your browser BottleShip bottleship.pages.dev FreeNo signup That one website that plays classic text adventures and interactive fiction right in your browser Parchment iplayif.com FreeNo signup That one website that times your Rubik's cube solves and tracks your speed over time csTimer cstimer.net FreeNo signup That one website that lets you play with falling sand Sandspiel sandspiel.club FreeNo signup That one website that plays endless generative music to work or relax to Generative.fm generative.fm FreeNo signup That one website that turns live Wikipedia edits into music Listen to Wikipedia listen.hatnote.com FreeNo signup That one website that searches only the old-school, hand-made personal web Wiby wiby.me FreeNo signup That one website that runs a classic Mac or old PC right in your browser Infinite Mac infinitemac.org FreeNo signup That one website that generates a whole fantasy world map for your D&D campaign Azgaar's Fantasy Map Generator azgaar.github.io FreeNo signup That one website that lets you doomscroll random Wikipedia articles like TikTok WikiTok wikitok.io FreeNo signup That one website that draws every road in any city at once, making a surprisingly beautiful map City Roads anvaka.github.io FreeNo signup