SDL TRADOS - Computer-Assisted Translation tool, enabling the use of Translation memory.
WADE - The easiest 2D and isometric HTML5 engine to make amazing web games and apps. Free and open source.
OmegaT - OmegaT is a free open-source translation memory application for professional translators written in Java.
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.
Poedit - Poedit translations editor. The best way to translate apps and sites.
Allegro - Allegro 4 and Allegro 5 are cross-platform, libraries mainly aimed at video game and multimedia...