Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
Quest - Quest lets you create sophisticated text-based games, without having to program.
Squiffy - Squiffy is a tool for creating multiple choice interactive fiction.
Yarn Spinner - Tool for creating interactive dialogue and games in Unity.
textadventures.co.uk - Create, play and share text adventure games.