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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.
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.
github.com
OpenUI is a GitHub repository or organization with source code, releases, documentation, or project resources.
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.
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.
optunity.readthedocs.io
Optunity is a Python library containing various optimizers for hyperparameter tuning. It provides several approaches to solving tuning problems, including cross-validation facilities and score functions. The documentation states it is supported in R, MATLAB, GNU Octave and Java through Jython, and is free software under a BSD-style license.
oracle.com
Oracle Cloud Free Tier lets users build, test and deploy applications on Oracle Cloud. It includes Always Free cloud services usable for an unlimited time and a US$300 cloud credit to use within 30 days on all OCI services. After 30 days, accounts continue to receive Always Free services.
ordrumbox.com
orDrumbox is a free online drum machine and multi-track step sequencer that runs in a web browser. It offers a step sequencer, automatic rhythm and pattern generation, an integrated software synthesizer, and drum kits and audio samples. Users can create and edit drum patterns and export them as WAV files.
organicchemistrydata.org
OrganicChemistryData.org is an encyclopedic collection of information, data, resources and links for organic chemists, curated by the ACS Division of Organic Chemistry. It covers reaction information, chemical data, spectroscopy resources, organic compound information, safety resources, literature sources, laboratory techniques and software.
organicmaps.app
A free, open-source, privacy-focused offline maps and GPS app for hiking, cycling, biking and driving, powered by OpenStreetMap data. It offers detailed offline maps, cycling routes, hiking trails and walking paths, turn-by-turn navigation with voice guidance, and offline search on downloaded maps. The app is developed by the open-source community and the creators of MapsWithMe/Maps.Me.
orionoid.com
Orion is an indexer and search engine for torrent, usenet, and hoster links. It provides an API integrated into Kodi addons and mobile apps for finding links to movies and TV shows. Orion does not host or distribute files and complements debrid services. The database is community-maintained and offers anonymous cryptocurrency payments.
osvault.weebly.com
OS Vault is a directory page linking to repositories for downloading Windows versions from Windows 1.0 to Windows 11, including pre-alpha, alpha, beta and RC builds, other Microsoft products such as Office and Plus, and a virtual machine program. It also links to official Microsoft desktop themes for several Windows versions and skins for Windows Media Player 9 Series. The site states it is not an official Microsoft website.
github.com
Oscp Exam Report Template Markdown is a GitHub repository or organization with source code, releases, documentation, or project resources.
noraj.github.io
A project providing Markdown templates for Offensive Security exam reports, covering exams including OSCP, OSWE, OSCE, OSEE and OSWP. It aims to replace LaTeX, Microsoft Office Word and LibreOffice Writer for report writing. Report generation uses a script and requires Pandoc, LaTeX and p7zip. Optional Pandoc Lua filters can be passed.
github.com
OSS Gallery is described as a crowdsourced list of the best open-source projects on the internet. It is built with the Dub TypeScript SDK, which creates short links for each project page and displays real-time click analytics.
overapi.com
OverAPI.com is a site that collects all the cheat sheets. It organizes reference sheets for programming languages, frameworks, and developer tools, listing topics from Python and JavaScript to HTML, SQL, and Linux.
github.com
overmind is a GitHub repository or organization with source code, releases, documentation, or project resources.
own-free-website.com
Own-Free-Website.com is a service for creating a free homepage without coding skills. It offers a short ".page.tl" domain ending, up to 1 gigabyte of free web space, design templates, and features such as a guestbook, hit counter and survey function. Premium packages are available for extending a site.
owncast.online
Owncast is a free and open source live video and web chat server that works with existing broadcasting software. Users point their live stream at an Owncast server they control. It includes built-in chat with moderation tools and custom emotes, custom branding and domain options, notifications, and fediverse support. It runs on the user's own server with standard streaming protocols.
github.com
oxker is a GitHub repository or organization with source code, releases, documentation, or project resources.
ozone3d.net
Ozone3D.Net offers free 3D graphics software and tutorials, including a set of GPU benchmarks and utilities. The listed tools include GPU Caps Viewer, a freeware utility describing graphics card capabilities, memory and OpenGL support, and GPU Shark, a GPU monitoring utility for NVIDIA and AMD/ATI cards. FurMark is a Freeware OpenGL 2 benchmark stressing vertex and pixel processors through fur rendering.
pa11y.org
Pa11y is a set of free and open source tools for automated accessibility testing of web pages. The command-line interface loads pages and highlights accessibility issues, while Pa11y Dashboard tests pages daily and graphs improvements and regressions. Pa11y Webservice is the JSON-based webservice behind the dashboard, and Pa11y CI iterates over a list of pages for use in CI.
The Pacific Northwest National Laboratory DataHub is a searchable repository of scientific data and publications. The site offers filtering by category, content type and tags across topics such as biology, earth system science and computing. Listed content types include publications, datasets, people, projects, data sources, institutions and software.