CKEditor - Real-time collaborative future-ready rich text editor
SFML - SFML provides a simple interface to the various components of your PC, to ease the development of games and multimedia applications. It is composed of five modules: system, window, graphics, audio and network.
TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...
Trumbowyg - Feature-packed WYSIWYG editor in only 15kB of JavaScript
raylib - Cross-platform, open-source game development library in C.