Apps to Cross-platform

PyQt is a Python binding for the powerful and versatile Qt cross-platform GUI toolkit. It allows Python developers to create feature-rich graphical applications for desktop, mobile, and embedded platforms.

Tcl (Tool Command Language) is a dynamic, high-level scripting language ideal for rapid application development, scripting, and automation, particularly strong in graphical user interfaces.

Xfe is a lightweight and fast graphical file manager for the X Window System, providing essential file management operations with a focus on efficiency and customization.

Aquamacs Emacs is a robust, free, and open-source text editor specifically tailored for the macOS environment, built upon the powerful Emacs framework. It provides a familiar Mac experience while leveraging Emacs' extensive customization and feature set, making it ideal for developers across various programming languages.

JOE (Joe's Own Editor) is a venerable, full-featured terminal-based text editor known for its ease of use and extensive feature set, making it suitable for both casual editing and complex programming tasks within the command line environment.

ghostwriter is a clean, distraction-free Markdown editor designed for Windows and Linux, emphasizing a focused writing experience. It offers a minimalist interface, live preview of your Markdown rendering, and essential writing tools for individuals who prioritize a clear and uncluttered workspace.

wxMEdit is a versatile cross-platform text and hex editor, serving as a powerful alternative to the discontinued MadEdit. Built on C++ and wxWidgets, it provides developers and advanced users with robust features for editing text files and binary data.

Jython is a Python implementation designed to run on the Java Virtual Machine (JVM). It allows Python developers to leverage Java libraries and frameworks, and Java developers to integrate Python scripting into their applications, bridging the gap between the two ecosystems.

Babun is a Windows shell with a focus on developers, providing a Unix-like command-line environment powered by Cygwin. It offers a wealth of pre-configured tools and features for seamless development workflows on Windows.

OpenFrameworks is a free and open-source C++ toolkit crafted for creative coding. It provides a powerful yet accessible environment for developing cross-platform applications focused on graphics, audio, and real-time interaction, making it ideal for artists, designers, educators, and researchers.

JRuby is a robust implementation of the Ruby programming language built on the Java Virtual Machine (JVM). It provides seamless interoperability between Ruby and Java, allowing developers to leverage the strengths of both ecosystems.

Cocos2d-x is a renowned open-source, cross-platform 2D game engine. Favored by mobile game developers for its efficiency and ease of use, it provides a robust framework for creating engaging 2D games with excellent performance across multiple devices and operating systems. Its flexibility and extensive feature set cater to both beginners and experienced developers.

FreeBASIC is a free and open-source multiplatform BASIC compiler. It supports a wide range of operating systems including Windows, Linux, and macOS (via third-party ports), facilitating cross-platform development. It's designed to be highly compatible with QuickBASIC while offering numerous modern features like object-oriented programming, manual memory management, and support for graphics and sound libraries, making it suitable for various programming tasks from system utilities to game development.

Ionic Framework is an open-source UI toolkit for building high-quality, cross-platform mobile, desktop, and web applications from a single codebase. leveraging web technologies.

jQuery Mobile is a comprehensive HTML5-based user interface system designed to make responsive websites and apps that are accessible on all smartphone, tablet, and desktop devices.

Tellico is a comprehensive KDE application designed for meticulously organizing diverse personal collections including books, movies, music, video games, stamps, coins, comics, and more. It offers pre-defined templates and powerful customization options to manage your items effectively.

Pure Data (Pd) is a widely-used graphical programming environment developed by Miller Puckette. It provides a visual interface for creating interactive computer music, multimedia works, and various forms of digital art through signal processing and event modeling.

Urho3D is a free, cross-platform 2D/3D game engine written in C++ and released under the MIT license. It is known for its lightweight design and efficiency, making it a suitable choice for various game development projects.

Zathura is a highly customizable and efficient document viewer based on the Poppler rendering engine. It is designed with a minimal interface and focuses on keyboard-driven navigation, making it ideal for users who prefer a streamlined workflow and powerful keybindings.

Clojure is a dynamic, functional dialect of the Lisp programming language on the Java virtual machine (JVM). It emphasizes immutability and persistent data structures for robust concurrent programming.

Free Pascal Compiler (FPC) is a robust and versatile compiler for Pascal and Object Pascal, distributed under the GNU GPL. It supports numerous platforms and architectures, enabling developers to create a wide range of applications from console tools to cross-platform GUI applications.

UFRaw (Unidentified Flying Raw) is a powerful and flexible open-source application designed for processing and manipulating raw image files from digital cameras. It provides a comprehensive suite of tools for non-destructive editing, batch processing, and conversion.

Swift is a powerful and intuitive compiled programming language from Apple, building on the best of C and Objective-C without the constraints of C compatibility. It's designed for safety, performance, and modern software design patterns, enabling developers to create apps for iOS, macOS, watchOS, tvOS, and beyond.

Simple DirectMedia Layer (SDL) is a cross-platform, open-source development library offering low-level access to essential hardware like audio, input devices, and graphics APIs (OpenGL, Direct3D). It's a fundamental layer for game development and creating interactive applications.

Erlang is a powerful functional programming language designed for building highly available, scalable, and fault-tolerant soft real-time systems. It excels in concurrent and distributed environments, making it ideal for applications requiring continuous uptime and handling vast amounts of concurrent requests.

RainLoop Webmail is a modern, fast, and user-friendly web-based email client designed for ease of use and robust functionality. It provides a clean interface for managing emails, supporting various protocols like IMAP and SMTP, and offers features like PGP encryption and multi-user support.

YACReader is a comprehensive and user-friendly comic book and manga reader and manager for various platforms. It supports popular comic file formats like CBR, CBZ, ZIP, and RAR, offering a seamless reading experience and robust library organization tools.

SoapUI is a powerful, open-source testing tool specifically designed for testing web services built on SOAP and REST architectures. It provides a comprehensive suite of features for functional, performance, and security testing.

Spek is a lightweight, cross-platform acoustic spectrogram viewer primarily designed for audio analysis. It visually represents the frequency spectrum of audio files over time, providing insights into audio quality, artifacts, and mastering issues. Ideal for audiophiles and audio engineers looking for a simple yet effective tool.

MilkyTracker is a free, cross-platform music tracker inspired by FastTracker 2, designed for composing music in MOD and XM module formats. It's a powerful tool for creating chiptune, demoscene, and electronic music, offering precise control over sound and sequencing.