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OnlySwitch is a macOS menu-bar app that gathers everyday system controls into one customizable menu bar, including hiding desktop icons, changing appearance, keeping the Mac awake and managing the notch. Switches and Shortcuts can be added, removed, reordered, assigned keyboard shortcuts, or placed on the desktop as widgets.
Open Android Backup is a shell script and Flutter app for locally backing up and restoring Android devices. It runs on Windows, macOS and Linux, uses 7-Zip archives, and encrypts and compresses backups by default. SMS messages and call logs cannot currently be restored, and app data is not saved due to Android restrictions.
OpenClaw is an open-source AI assistant that runs on the user's machine and works from WhatsApp, Telegram or other chat apps. According to the site, it organizes inboxes, sends emails, manages calendars and checks users in for flights. Desktop apps are listed for macOS, Windows and Linux, and an enterprise platform is in development ahead of a 1.0 release.
OpenCode is an open source AI coding agent available as a terminal-based interface, desktop app, or IDE extension. It supports multiple LLM providers and local models, and does not store code or context data. Enterprise options include centralized configuration, SSO integration, and an internal AI gateway.
The OpenConnect VPN server (ocserv) is an open source Linux SSL VPN server designed for organizations requiring a remote access VPN with enterprise user management and control. It secures VPN channels using standard protocols like TLS and Datagram TLS, and its performance scales linearly with the number of CPUs.
openHAB is a vendor- and technology-agnostic open source automation software for the home, developed in Java on Apache Karaf. Its pluggable architecture supports over 400 technologies and thousands of devices, with rules driven by time, events, scripts, actions, notifications and voice control. It runs on Linux, macOS, Windows, Raspberry Pi, Docker and Synology, and is accessed through web, iOS and Android apps. It runs on local hardware without requiring cloud services.
OpenMTP is a free, open-source Android file transfer application for macOS that moves files between Mac and MTP devices such as Android phones, Kindle, Garmin, FujiFilm and Meta Quest VR. It supports Apple Silicon and Intel Macs, offers drag-and-drop, file renaming, SD card access and dark mode.
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.
OpenRGB is open source RGB lighting control software that does not depend on manufacturer software. It runs on Windows, Linux and MacOS, replacing proprietary RGB apps with a lightweight interface. It offers a network-based SDK with bindings for multiple languages and a plugin interface. Version 1.1 is referenced.
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.
OpenShot is a free, open-source video editor for Linux, Mac, and Windows. It provides color grading and scopes, video effects, keyframe animation, timeline editing, transitions and wipes, interactive video masks, audio visualizations, and 2D and 3D titles. The project is written with Python and PyQt5, uses a C++ backend built on FFmpeg, and is distributed under the GNU General Public License.
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.
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.
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.
Orkas is an open-source, local-first AI desktop app. A commander LLM directs specialist sub-agents and runs installed coding CLIs including Claude Code, Codex, OpenCode, OpenClaw, and Hermes as local sessions. Its agents self-evolve via reflection and skill crystallization, supports bring-your-own keys, and is compatible with macOS, Windows, and Linux.
Osaurus provides AI agents that run locally on a computer rather than in a cloud. Agents work from files, keep memory on the computer, and request approval before editing files. A privacy filter can remove identifying details before cloud use. Osaurus is free and MIT licensed; Workspaces starts at $20 per workspace per month.
Osaurus is an open source, native macOS harness for AI agents. It supports any AI model, offers persistent memory, autonomous execution, and cryptographic identity, is built in Swift, and operates fully offline.
OSBoxes provides ready-to-use virtual machine images in VDI, VMDK and VHD formats for VirtualBox and VMware. The site offers images of Linux and Unix systems that can be downloaded and run as a virtual machine on a host system, avoiding installation alongside the main operating system.
The Open Source Games List (OSGL) is a site for browsing technical information about open source games and related engines, frameworks and tools. Content is based on descriptions stored on GitHub, and supported platforms include Windows, Linux, macOS, Android, iOS and web. The site states it is a best-effort result likely to contain inaccurate information.
Osintme.com is a blog by Matt publishing articles and resource lists for OSINT investigators. Posts cover web browsers and Linux desktop apps for OSINT machines, Reddit research tools and techniques, darkweb resources, favicons in website research, ransomware research resources, and recommended OSINT newsletters. It also covers CISSP exam study tips.
OSMC is a free and open source media center built on Debian Linux and Kodi Media Center. It offers an App Store for customization and plays major media formats from various devices and streaming protocols. Vero V is the project's flagship device, with support for 4K, HDR and HD audio.
ossia score is a free, open-source intermedia sequencer for Windows, macOS and Linux. It sequences audio, video, OSC, MIDI and DMX on an interactive timeline and supports scripting with JavaScript and Faust. It is used for interactive shows, installations and live electronic music.
OSX-KVM is a tool that enables running macOS on QEMU/KVM. It supports OpenCore and macOS Monterey, Ventura, and Sonoma, requires no Mac system, and currently offers only commercial paid support.
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.
