Twine is an open-source tool for creating interactive fiction and hypertext games. Its AI suggests branching narratives and helps structure non-linear stories for text-based game creation.

GameMaker by YoYo Games is a 2D game development engine with a visual scripting system and its own programming language (GML). Indie developers use it to create cross-platform games for Windows, macOS, mobile, and consoles with minimal coding.

Modl.ai is a pioneering AI-driven game testing platform that automates bug detection, playtesting, and difficulty tuning using deep reinforcement learning. Its AI agents simulate thousands of player behaviors to identify bugs, balance issues, and usability problems that human testers might miss. Modl.ai automatically categorizes and reports issues, provides heatmaps of player behavior, and suggests difficulty adjustments based on testing data. Game developers use it to dramatically reduce QA testing time, catch edge-case bugs, and ensure balanced gameplay experiences before launch.

PlayCanvas is a WebGL game engine with AI-assisted development, real-time collaboration, and one-click web publishing for browser-based 3D games.

Adventure Game Studio is a free game engine for creating point-and-click adventure games with AI-powered scripting, character animation, and puzzle design.

RPG Maker MZ is the latest version with AI-assisted character generation, map auto-fill, and event creation. RPG creators use it for developing narrative-driven games with custom assets.