Open Directory Downloader indexes open directory listings across more than 130 supported formats, including FTP, Google Drive, AList, and GoIndex. It is written in C# with .NET (Core) and is cross-platform. Downloading is not yet implemented, but the resulting file can be used with tools such as wget or aria2c.
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Open TV, now known as Fred TV, is a cross-platform IPTV application. It is described as ultra-fast, simple, and powerful. The project seeks community support and accepts donations via GitHub, PayPal, or cryptocurrency.
OpenCV is an open source computer vision library that contains over 2500 algorithms and supports model execution for machine learning and artificial intelligence. It was designed to be cross-platform, written in C with C++ and wrappers for Python and Java, and runs on desktop and mobile systems. A GPU module implemented with CUDA provides acceleration for part of the library.
An open-source tool that captures digital history through regularly taken screenshots. Text and images in the screenshots are analyzed and made searchable, and users can scroll back through past activities. It is described as cross-platform.
OpenRocket is a free model rocket simulator that allows users to design and simulate rockets before building and flying them. It offers a six-degrees-of-freedom flight simulation, CAD-based design, real-time performance data and design optimization. It is written in Java and is cross-platform, with source code available under the GNU GPL.
Orange is a cross-platform desktop application for searching local files. It offers tokenization and auto completion, monitors file system changes in real time, and provides millisecond-level search with low memory and CPU resource usage.
PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor and viewer with multi-user capabilities. It uses the Eto.Forms cross-platform framework for native UI on Windows, macOS and Linux, and Version 3.3 is described as still in alpha.
Pact is a cross-chain automated market maker and DeFi platform. Its aggregator routes swaps across every DEX on Algorand to find the cheapest fill. It offers concentrated, traditional AMM, and stable-swap pools with multiple fee tiers, plus farms for staking LP tokens and reward programs.
PaddlePaddle is an open-source parallel distributed deep learning framework developed from industrial practice, designed for high-performance single-machine and distributed training, as well as cross-platform deployment of deep learning and machine learning models.
PairDrop is an open-source, peer-to-peer cross-platform file transfer tool. It allows users to instantly share images, videos, PDFs and links with people nearby, with no setup or signup required. The service requires JavaScript to function and supports multiple languages.
Pake is a tool that turns any website into a lightweight desktop app with one command, supporting macOS, Windows and Linux. It is built with Rust Tauri and offers one-command packaging via CLI, an online build option, and ready-made packages for popular sites. It supports shortcuts, immersive windows, drag and drop, style customization and ad removal.
PeaZip is an open source cross-platform archive manager for Linux, macOS and Windows, offered as a freeware alternative to WinRar, WinZip and similar utilities. It creates, opens and extracts 7z, rar, tar and zip files and many more archive formats. Precompiled DMG packages are available for Darwin and macOS, built for Apple Silicon and Intel architecture.
PEmbroider is an open-source, cross-platform lightweight Java library for generative embroidery design that integrates with the Processing creative coding framework. It is intended for artists, craftspersons, educators, makers, and schools, and can generate embroidery files in .DST, .EXP, and .JEF formats. The library was developed at the CMU Frank-Ratchye STUDIO for Creative Inquiry and is released under the GNU General Public Licence (GPLv3) and Anti-Capitalist Software License (ACSL 1.4).
Penguin Subtitle Player is a cross-platform application for displaying subtitle files over online video.
Petmate is a cross-platform C64 PETSCII image editor that runs locally on Mac, Windows and Linux without an internet connection. It supports drawing operations, multiple screens with undo stacks, and import or export of PETSCII formats including PNG, .c, .prg, .asm and .d64.
Photon is a cross-platform file transfer application built with Flutter. It shares folders, files and text, supports folder sharing that preserves directory structure, and works between devices on the same local network or mobile hotspot without an internet connection.
Photon is a cross-platform file and folder transfer application built with Flutter. It uses HTTP to transfer files between devices running Photon, without requiring an internet connection or Wi-Fi router; devices can connect via mobile hotspot or the same local area network. It supports sharing multiple files, raw text, and entire folder structures.
PlayTracker is an app that connects to gaming platforms and combines their data, including games, achievements and stats. It offers cross-platform profiles, social feeds, challenges and estimates. A web version is available, with an ad-supported Windows desktop app and mobile apps listed as coming soon. Paid Indie and Pro subscription tiers exist for professionals.
Poedit is a cross-platform translation editor available for Mac, Windows, and Unix systems. It supports editing translation file formats including PO, XLIFF, and JSON, and is hosted in the vslavik/poedit GitHub repository.
The Polygon Blog publishes news, analysis and deep dives from the team behind Polygon Open Money Stack, covering stablecoin payments, cross-border infrastructure and enterprise fintech. Posts include updates on the Open Money Stack payments platform.
PowerShell is a cross-platform automation and configuration tool and framework for Windows, Linux and macOS. It includes a command-line shell, a scripting language and a framework for processing cmdlets, and is optimized for structured data, REST APIs and object models. The repository covers PowerShell 7.x and higher; changes are not ported back to Windows PowerShell 5.1.
ProperTree is a cross-platform GUI plist editor written in Python and Tkinter. It offers document-based multiple windows, node drag and drop, find and replace, ordered or unordered dictionary support, an undo-redo stack, and context-aware right-click menus with templates for OpenCore or Clover configuration files.
qView is an image viewer described as practical and minimal, designed with minimalism and usability in mind. The project is cross-platform and lightweight, built with Qt widgets and released under the GPL-3.0 license.
Qalculate! is a multi-purpose cross-platform desktop calculator. It provides everyday tools such as currency conversion and percent calculation, along with advanced capabilities including symbolic calculations, arbitrary precision, unit conversions, and plotting. The software includes over 400 functions and 400 units, supports various number bases, and offers a user-friendly interface with Gtk, Qt, and CLI options. It is free software licensed under the GNU Public License v2 or later.