Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Yarn Spinner - Tool for creating interactive dialogue and games in Unity.
ADRIFT - Create your own Interactive Fiction with this free, easy to use application for Windows.
ifSpace - An interactive Fiction Space Engine and application for creating and playing Interactive Fiction games (e.g.: Colossal Cave, Zork, Choose your path books) with no coding required.
Squiffy - Squiffy is a tool for creating multiple choice interactive fiction.