Flyspray is a lightweight, web-based bug tracking system written in PHP for assisting with software development and project managements.
License: Open Source
SprintGround is a comprehensive project management tool with advanced features like customizable fields, time tracking, and a mobile app, making it suitable for larger teams and complex projects. In contrast, Flyspray is a simpler, open-source issue tracking system that is lightweight and easy to use, ideal for smaller teams and straightforward task management.