Twine - Twine is an open-source tool for telling interactive, nonlinear stories.

Yac - Take your time back from Zoom & Slack

Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers

Telbee.io - telbee adds voice messaging to podcasts, websites, social media and email to easily hear from and build human relationships with your customers and community - save time, reduce frustration, and gain sales, understanding and fans

Quest - Quest lets you create sophisticated text-based games, without having to program.

Angle Audio - Live audio conversations as a service