. FontForge is a classic, powerful, free and open-source font editor for Windows, Mac and Linux platforms, originally developed by George Williams in 2001. It has gained popularity among type designers and typography enthusiasts for its comprehensive feature set and friendly interface. It supports a wide array of font formats, including TrueType, OpenType, and PostScript, allowing users to create, modify, and convert fonts with ease.

ReactOS is a free, open-source Windows NT-like operating system for both 32-bit and 64-bit personal computers, originally developed in 1996. It maintains system-level compatibility with Windows (including computer programs and device drivers developed for Windows Server 2003 and later versions of Windows), and is committed to becoming a perfect replacement for the Windows NT series.

Acode (AKA: Acode editor) is a small yet very powerful code viewer + code editor + code debugger and Web IDE for Android platform, developed by Foxdebug from India. You can use it to view, edit and debug HTML, JavaScript, MarkDown directly on your Android-based smartphone or tablet PC.