Mac OS X Softwares to Cross-platform

GIMP (GNU Image Manipulation Program) is a powerful, free, and open-source raster graphics editor used for image manipulation, retouching, composition, and authoring. It supports a vast array of file formats and provides sophisticated tools comparable to commercial alternatives, making it a versatile choice for photographers, designers, and artists.

Abricotine is a user-friendly markdown editor designed for distraction-free writing with an intuitive inline preview.

Firebird is a powerful, open-source relational database management system (RDBMS) known for its small footprint, high performance, and low maintenance requirements. It offers support for major ANSI SQL standards, making it a reliable choice for various applications from embedded systems to enterprise solutions.

Apache OpenOffice Base is a robust desktop database management system designed to cater to a wide range of database needs, from simple home use to complex business applications, offering a user-friendly interface for creating and managing databases.

Nim is a modern, statically typed, compiled programming language emphasizing efficiency, expressiveness, and flexibility. It draws inspiration from languages like Python, Pascal, and C++, making it approachable for developers while offering low-level control for systems programming.

Filedrop is a remarkably simple and fast peer-to-peer file sharing platform that enables quick and secure transfers between devices without the need for accounts or cloud storage. Leveraging direct connections, it offers a streamlined experience for sharing files large or small, featuring drag-and-drop functionality and real-time collaboration capabilities.

LibGDX is a robust, free, and open-source Java game development framework designed for creating 2D and 3D games across multiple platforms including Windows, macOS, Linux, Android, and web browsers.

Couchbase is an open-source, distributed NoSQL cloud database that provides high-performance, flexibility, and scalability for modern applications, optimized for interactive systems requiring low latency and high throughput.

F# is an open-source, cross-platform, functional-first programming language designed for conciseness and correctness. It integrates seamlessly with the .NET ecosystem, making it ideal for data science, web development, and more.

Kotlin is a modern, statically-typed programming language developed by JetBrains. It runs on the Java Virtual Machine (JVM), Android, and the web (via JavaScript), and can compile to native code. Designed for concise, safe, and interoperable code, Kotlin aims to make programming more enjoyable and productive.

GoAruna is a comprehensive file management and cloud storage solution for Android devices. It combines a powerful local file manager with integrated online file hosting, sharing, and synchronization capabilities. GoAruna aims to provide unlimited storage and seamless file access across various platforms.

Zero Install is a decentralized cross-platform software distribution system that eliminates the need for traditional installers. It allows users to run applications directly from their original sources, ensuring reliable updates and minimizing dependencies.

Demonsaw is a secure, open-source platform for decentralized information sharing, focusing on user anonymity and privacy through robust end-to-end encryption and a serverless architecture.

fman is a powerful, dual-pane file manager designed for speed and efficiency across Windows, macOS, and Linux. It offers a clean interface, robust search capabilities, extensive keyboard shortcut support, and a flexible plugin system for enhanced functionality.

RethinkDB is a free and open-source, distributed document database designed for building real-time web applications.

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.

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.

Tomato is a highly regarded custom firmware designed for Broadcom-based routers, offering advanced features and enhanced control beyond the stock manufacturer firmware. While discontinued, it remains a popular choice for users seeking improved network performance, diagnostics, and configuration options on compatible hardware.

SunVox is a compact yet powerful modular synthesizer and tracker-based music production environment for creating electronic music on various platforms.

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.

Chrome Secure Shell is a robust, xterm-compatible terminal emulator and native SSH client for Chrome. It provides secure remote access to servers directly from your browser, offering essential features for network administration and development tasks within the familiar Chrome environment.

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.

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.

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.

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.

DataGrip is a powerful, cross-platform IDE designed for database administrators and developers, providing a unified environment for managing multiple databases with intelligent coding assistance, schema navigation, and integrated tools.

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.