
Description: Yarn Spinner is an open-source dialog engine for games. It allows developers to write character dialogue in YAML files and integrate it into Unity games using C# code. Key features include a node-based conversation editor, localization support, and options for branching dialog.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Undum is an open source tool for creating choice-based interactive fiction stories and games. It provides a lightweight framework for developer to build non-linear narratives that users can explore through clicking links and making choices.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API