Apps Related to Cross-Platform Support

VLC Media Player is a free and open-source cross-platform multimedia player that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols. Known for its robust format support and stability, VLC is a favorite for playing virtually any media file without the need for external codecs.

The Mana World is a free, community-driven 2D open-source MMORPG set in a vibrant, evolving pixelated world. Available across multiple platforms, it offers players a classic online fantasy role-playing experience with a focus on exploration, questing, and skill development.

SoftEther VPN is a free and open-source, cross-platform, multi-protocol VPN software solution. It functions as both a VPN client and server, offering high compatibility and advanced features for building secure and flexible VPN connections.

Butter Project is a discontinued open-source application suite designed for streaming video content over the BitTorrent protocol. It allowed users to watch movies and videos directly from torrents without needing to download the entire file, leveraging peer-to-peer technology for media consumption.

GNU Privacy Guard (GnuPG or GPG) is a free and open-source implementation of the OpenPGP standard, widely used for encrypting and signing data and communications. It provides a robust suite of command-line and graphical tools to protect sensitive information.

Pencil Project is a free and open-source GUI prototyping tool that helps designers and developers create wireframes and mockups easily. Available as a standalone application and a Firefox extension, it offers a wide range of built-in shapes and templates for various platforms.

Apache OpenOffice is a comprehensive and free office suite providing essential tools for document creation, spreadsheet analysis, captivating presentations, and more. It offers cross-platform compatibility and support for various file formats.