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OpenMPT (Open ModPlug Tracker) is a free tracker software for Windows that is a step sequencer supporting many tracker module formats. It can create and play back music, import a wide variety of module formats, and natively edit Impulse Tracker, FastTracker, Scream Tracker and ProTracker module files. It offers a native GUI, VST plugins and ASIO output.
OpenPanel is a multi-user web hosting control panel built around lightweight containers. Each user gets an isolated environment with a separate MySQL server, PHP version, Redis instance and root access. Administrators and resellers manage servers through the OpenAdmin panel, and the OpenPanel interface lets clients manage domains, websites, services and email. OpenCLI provides terminal commands for panel actions.
Openpanel is a GitHub repository or organization with source code, releases, documentation, or project resources.
A page listing email applications across Windows, macOS, Android, iOS, Linux, browser plugins and webmail providers that support the OpenPGP standard, either directly or with additional software. The page states that its authors do not actively participate in developing these third-party apps and have not performed security audits.
OpenRabbit is a free, open-source, self-hosted GitHub pull request reviewer. It analyzes PR diffs, consults a pluggable LLM provider such as Groq or OpenRouter, and posts a summary with inline comments. It runs entirely in GitHub Actions, so no server or hosting subscription is required, and code stays in the user's runner.
Explore railway infrastructure on a world map.
OpenSCA-CLI is a GitHub repository or organization with source code, releases, documentation, or project resources.
OpenSCAD is free software for creating solid 3D CAD models, available for Linux/UNIX, Windows and Mac OS X. It is not an interactive modeller; instead it reads a script file describing an object and renders the model. It focuses on CAD aspects rather than artistic modelling and provides constructive solid geometry and extrusion of 2D outlines.
Continue is an open source coding agent. It is hosted on the GitHub repository continuedev/continue, which includes project documentation and notes a final 2.0.0 release. Contributors can engage with the project by creating a GitHub account.
Kilo - Open-source AI coding assistant for VS Code, JetBrains, and the CLI.
Model Context Protocol - An open standard for connecting AI models to external tools and data sources. MCP Registry.
Vanna is an open source tool that enables users to interact with SQL databases via natural language. It uses large language models and agentic retrieval to generate accurate text-to-SQL queries.
Opensource.guide is a GitHub repository or organization with source code, releases, documentation, or project resources.
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.
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.
OpenUI is a GitHub repository or organization with source code, releases, documentation, or project resources.
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.
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 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 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 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.
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.
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 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.
