itch.io

Blending narrative storytelling with player choice, often text-based experiences where readers shape the story through their decisions. These works can range from simple branching narratives to complex simulations, offering immersive worlds and character-driven plots that unfold based on user input.

Focused on using its text, moreso than its visuals or audio, to tell the bulk of its story/plot. (Still can have great audio and visuals, though!)

Twine is a free and open source tool for telling interactive, non-linear stories.