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opensourcealternative.to
opensourcealternative.to is a free directory that bills itself as the world's largest collection of open source software alternatives to proprietary products. It hosts over 500 open source alternatives to popular proprietary tools, and reports that over 2 million users have replaced proprietary software with options found on the platform. Listed alternatives include game engines, business suites, observability platforms, communication tools, and databases.
openstego.com
OpenStego is a free steganography tool written in pure Java. It provides data hiding, which hides data within a cover file such as an image, and beta watermarking, which embeds an invisible signature to detect unauthorized file copying. It supports password-based encryption with AES 128 and AES 256 and a plugin architecture.
opensupplyhub.org
Open Supply Hub is an open map where brands, suppliers, and advocates search, share, and collaborate on supply chain data. It maps production locations, assigns each location a universal OS ID, and standardizes shared data for matching. Suppliers can claim and verify their location on a free supplier database, and the platform is described as a Digital Public Good.
opensyllabus.org
OpenSyllabus is a non-profit archive of higher education teaching materials. It holds a collection of 32.9 million college syllabi from thousands of schools, providing curriculum overviews to support curricular innovation, lifelong learning, and student success. The project aims to expand open education, with most of its tools available for free. Additional offerings include an exploration tool for teaching across syllabi, a course transfer lookup tool, a navigable view of anglophone higher education, a print store for large prints of top-assigned academic titles, and a blog with news and data stories.
opentogethertube.com
OpenTogetherTube is an open source online service that lets users watch videos together with friends via real-time synchronized playback. It includes an optional voting system, a dark theme, and requires no user sign-up.
opentoonz.github.io
OpenToonz is open-source 2D animation production software based on Toonz, developed by Digital Video S.p.A. in Italy and customized by Studio Ghibli. Dwango launched the OpenToonz project with Digital Video and Studio Ghibli. It can be used free of charge for commercial and non-commercial projects.
opentopography.org
OpenTopography is a platform providing high-resolution topography data and tools, including lidar point clouds, digital elevation models and hillshade imagery. It offers data discovery, programmatic access to raster DEM datasets through a STAC catalog, and a Point Elevation API returning elevation for any location from global and regional datasets.
opentunnel.net
OpenTunnel is a free tunneling service offering SSH, V2Ray, XRay, OpenVPN, WireGuard and other accounts. The site states that accounts are free, servers offer unlimited bandwidth and are online 24 hours, and no logs are used to monitor activity. It lists total server counts per protocol.
openutau.com
OpenUtau is an open singing synthesis platform described as an open source UTAU successor. It is available as a Windows x64 installer and portable versions, with installation guides for macOS x64 and Linux x64. A beta is referenced for DiffSinger or the arm64 version for macOS.
openvideofs.github.io
OpenVideo is a browser extension that detects videos on video streaming platforms and plays them in an ad-free player, allowing users to watch or download videos and movies without ads or popups.
openvim.com
OpenVim provides educational videos, lessons, tutorials, or self-learning resources.
openwhyd.org
Openwhyd is a community site for discovering and collecting music tracks from YouTube, Soundcloud, Deezer and other services. Users can add tracks to collections, and other users can add, like, comment on and share them. The site also offers a mobile track finder for locating favorite tracks on the go. It is maintained collaboratively under the MIT License.
openworm.org
OpenWorm is an open source project that aims to create a virtual C. elegans nematode in a computer. Its sub-projects include a worm body simulator with physics of muscles, soft tissues and fluids, WormSim for interacting with the worm in a browser, DevoWorm for developmental processes, a 3D Browser, the NeuroML Connectome, and Geppetto. Code and models are released under the MIT licence.
openwrt.org
The OpenWrt Project is a Linux operating system targeting embedded devices. It provides a fully writable filesystem with package management rather than a single static firmware, allowing devices to be customized through packages. Current stable series is OpenWrt 25.12, with 24.10 as the old stable series. Source code is stored in a git tree.
opnxng.com
OpenXNG is a privacy-respecting, open metasearch engine powered by SearXNG version 2026.9.26+c52ce3835. The site provides access to the SearXNG source code, issue tracker, engine statistics, public instances, and contact information for instance maintainers.
ophysics.com
oPhysics is a collection of interactive physics simulations created by retired physics teacher Tom Walsh. Most animations and simulations were made with GeoGebra software. The site states it is a work in progress and content is added as time allows. Material may be used for non-profit educational purposes.
opnsense.org
OPNsense is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.
bible.beginnerprivacy.com
Opsec is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.
whos-zycher.github.io
OPSEC guide is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.
optery.com
Optery is an opt-out service that finds and removes personal information from data brokers and people-search sites. It provides an exposure report and self-service removal tools on a free tier, with paid plans adding automated removals and custom removal requests. A 30-day money-back guarantee is offered for individual accounts.
optimism.io
Optimism Blog covers crypto news, blockchain markets, Web3 projects, and digital asset industry updates.
app.optimism.io
Optimism Bridge is a DeFi bridge for moving assets, liquidity, or messages between blockchain networks.
optuna.org
Optuna is an open source automatic hyperparameter optimization software framework designed for machine learning. It provides an imperative, define-by-run style user API with eager search spaces, algorithms that prune unpromising trials, and parallelization of searches over multiple threads or processes without modifying code. It is framework agnostic and can be installed with pip on Python 3.10 or newer.