Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
Quest - Quest lets you create sophisticated text-based games, without having to program.
RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
Inform - Description The market is unpredictable and keeps on changing over time.
textadventures.co.uk - Create, play and share text adventure games.