Dialogue Designer
A branching dialogue editor for game developers. Can be used with any game engine / framework.
Whimtale game engine
Make interactive stories and games with this simple tool
Relic and Artifact Generator
Generate some relics for your fictional worlds!
BROKVN - Visual Novel Engine
Make your own visual novels with this free and easy to use tool
Folia
A minimal framework for narrative games.
Grimory - RPG System Designer
Design, simulate, and document your RPG system in an intuitive offline app.
Squeaker Dialogue Editor
Squeaker is a non-linear multi-language dialogue tree editor with many extra features.
Loreline Writer
Standalone editor to write Interactive Fiction
Dialogue Forge
A modular dialogue tool that supports any engine/framework that can read JSON files.
Whimtale HD
Make games and interactive stories with HD sprites!
ArcWright
Stop losing your story across fifteen tabs. One file, every world — offline, yours forever.
StoryFlow Easy: Visual Novel Editor
French, English, Spanish, Russian, Italian, Chinese
Booktasy
Parser-Based Interactive Fiction Tool
Unfurl
The dialogue convertor and editor for your games
Dialogue Tool for Larynx Text To Speech
[Bonus: NPC Speech download!] Give your characters a real voice easier with this tool & Larynx offline Text To Speech.
PS Maker
2D Game Maker Built for Storytellers
Всемогущие | Almighty RPG
Roleplaying god-simulator and game table tool (only russian language now)
NovGen
Create your world with your own rules and generate a novel from it