StoryNest.ai is an AI-powered platform for storytellers. It's got tools to create characters, build worlds and accommodate a variety of story forms like interactive fiction and novels. The tool also has AI-boosted editing and proofreading, voice narration and story analytics, so it's a pretty full-featured tool for writers.
Another good option is Charisma, which is geared specifically toward interactive stories with realistic virtual characters. It uses AI to power character conversations and has a no-code story engine so developers and creatives can use it. It can be used to build stories for the web, apps, games and VR, and it's got speech-to-text and generative AI dialogue tools.
If you want to build games, Tempest AI is a platform that lets you build games without writing any code. It uses AI to build dynamic characters, goals and storylines that change based on player choices. It's got tools for character creation, world building and story creation, so you can focus on the creative aspects of game development.