Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
Blockly - Blockly is a library for building visual programming editors.
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
EduBlocks - Making the Transition from Scratch to Python easier.
TyranoBuilder - A Easy Visual Novel Development Tool!