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openspeedtest.com
OpenSpeedTest is a browser-based HTML5 internet speed test that measures download, upload, ping, and jitter without Flash or Java. It works on phones, TVs, consoles, and computers. A free and open-source self-hosted server can be deployed, and a speed test widget can be embedded on websites or apps.
openstreetmap.org
OpenStreetMap is a map of the world created by contributors and free to use under an open license. The site offers help resources, including a beginners' guide, a community forum, mailing lists and a wiki.
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.
opentierboy.com
OpenTierBoy is a free, open-source platform for creating and sharing tier lists. It offers community-curated templates and lets users add custom images, which are not saved to a central database. Lists can be shared by copying the URL. The site states it has no ads, logins or sign-ups.
gitlab.com
OpenTodoList is a todo and task managing application written in Qt with a QML user interface. It targets typical desktop environments such as Windows, Linux and Mac OS X, as well as mobile devices like Android phones.
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.
opentracksapp.com
OpenTracks is an open-source sport tracking application described as completely respecting privacy. Its features include elevation gain estimates, Bluetooth LE heart rate sensors, photos and markers during tracking, online and offline maps, and map theming. A pure offline version without internet permission is available via F-Droid. The app contains no in-app analytics and no cloud integration.
openttd.org
OpenTTD is an open source simulator based on the classic game Transport Tycoon Deluxe. It attempts to mimic the original game as closely as possible while extending it with new features.
openvan.camp
Multilingual vanlife and motorhome news aggregator.
openverse.org
Search openly licensed images and audio from cultural, educational and media collections.
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.
catalog.opgc.uca.fr
Research data portal for exploring atmospheric records, including datasets.
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.
actrec.gov.in
Oral Cancer Gene Database is a research resource focused on oral cancer genomic and proteomic data. It offers access to gene lists, keyword search functionality, and interaction networks to support research into oral cancer diagnosis, prognosis and treatment.
orangedatamining.com
Orange is an open-source machine learning and data visualization toolbox. It offers visual programming in which widgets are placed on a canvas and connected to load datasets and analyze data. It supports interactive visualization methods including box plots, scatter plots, decision trees, hierarchical clustering, heatmaps, MDS, t-SNE and linear projections. Extensions add text mining, network analysis and other specialized capabilities.
orbi.uliege.be
ORBi is the institutional repository of the University of Liège. It holds deposited items and open access full texts, and offers a public interface where authors add their publications. The site provides guidance on first steps, on improving the visibility of research, and on linking ORBi information with ORCID identifiers.
orbot.app
Orbot is a Tor VPN for Android and iOS that routes app traffic through the Tor network. It lets Android users choose which apps route through Tor and allows apps to connect to onion services. It offers access to Tor Bridges for restricted networks. The project is free and open source, with code that anyone may inspect.
orcaslicer.com
OrcaSlicer is a free, open-source 3D printing slicer for FDM 3D printers, created by SoftFever. It runs on Windows, macOS, and Linux and is licensed under AGPL-3.0. The slicer includes a built-in calibration suite and per-feature control over print settings, with tuned profiles for printers from Bambu Lab, Prusa, Creality, Voron, and others. Network printing supports Klipper, PrusaLink, and OctoPrint.
Research data portal for exploring biology records, including experimental data.
ordar.otelo.univ-lorraine.fr
ORDaR is the institutional research data repository for Lorraine's geosciences. Its thematic coverage includes Earth dynamics, Earth chemistry, mineral and energy resources, the resource cycle, deep geological waste disposal, hydromechanics, soil and subsoil environmental management, water, ecotoxicology and biodiversity.
data.oregon.gov
Browse government and civic datasets for Oregon, United States.