Tech
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Online Ruler
A free on-screen ruler that measures in inches, centimeters, and millimeters at actual size on a phone, tablet, or compu…
Online Ruler
An on-screen ruler and protractor that shows actual size in centimeters, millimeters, and inches on any device, for quic…
Online Sequencer
A browser-based music sequencer for composing, playing, and sharing songs on a piano-roll grid.
Online Sign
A free printable safety sign maker with hundreds of pictograms and fully customizable text and colors, for building warn…
Online Tone Generator
A simple, precise online tone generator for testing hearing, tuning instruments, and exploring frequencies from 1 Hz to…
Online Tools
A collection of more than a thousand free browser utilities for editing images, animations, and text, from converters an…
OnlineBoard
A free whiteboard you open in the browser with no login, where anyone with the link sees your drawing in real time and y…
Onlytrains
A bot watches a single stretch of Swiss railway track, detects every passing train and stitches its frames into one long…
OnStartups
A long-running blog of insights and ideas for software startups, with advice for entrepreneurs on building, marketing, a…
OOER
A cyberpunk terminal-styled personal site with a boot sequence and themes, hosting stories about the web and frontend th…
Open Alternative
A directory of open-source alternatives to popular commercial software, useful for finding self-hostable replacements fo…
Open Circuits
Photos of electronic components cut in half to reveal their hidden insides, from resistors and capacitors to chips and L…
Open Logos
A free collection of logos for open source projects, gathered in one place for reuse in articles, slides, posters, and w…
Open Peeps
A free hand-drawn illustration library for building scenes of people, with mix-and-match bodies, faces and poses for pro…
Open Project Dashboard
A transparent dashboard of revenue and stats from Cory Zue's profitable side projects, showing what small software busin…
Open Source Afro Hair Library
A free library of high-quality 3D models of Black hair textures and styles, from coils and braids to locs, made for arti…
Open Source Alternative To
A directory of more than 500 open source alternatives to popular proprietary software, helping you find a free replaceme…
Open Source Alternatives
A directory of open-source alternatives to the commercial tools businesses rely on, for finding a free replacement for p…
Open Source Ecology
A maker collective publishing open-source blueprints for building your own farm and construction machinery from modular…
Open Source Game Clones
A huge browsable catalogue of open-source remakes and clones of classic games, from Doom and SimCity to Transport Tycoon…
Open Source Games List
A browsable catalogue of technical details on 1610 open source games and 320 engines, frameworks, and tools, useful for…
Open Source Rotary Cellphone
Justine Haupt's open-source rotary cellphone, a working mobile phone with a real spinning dial, with build notes, photos…
Open Startups
A directory of startups that publish their revenue, metrics, and stories openly, useful for seeing what real indie produ…
Open.gl
An extensive, beginner-friendly guide to modern OpenGL for game development on all major platforms, taking you from a bl…
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