RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
WinDev - Integrated software for developing cross-platform applications.
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
4D - 4D is a relational database management system and IDE.
TyranoBuilder - A Easy Visual Novel Development Tool!
Xojo - Real Software and Real Studio are now Xojo.