Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
BlitzPlus - Create 2D Games for Windows.
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
BlitzMax - With the developing version BlitzMax NG other 'targets' are available: ARM architecture, Raspberry, Android, HTML (Emscripten). RAPID DEVELOPMENT. Just open the IDE, write your code, hit F5 and see immediately the results!
Quest - Quest lets you create sophisticated text-based games, without having to program.
Monkey 2 - An easy to use, cross platform, games oriented programming language