itracker is a true open source issue tracking system. itracker is built using Java enterprise technology. itracker is a professional, easy to use, open, easy to integrate, fast, modular, customizable and scalable solution for all kinds of projects.
WorkingWiki is a MediaWiki extension that makes a wiki into a source-code repository, IDE, and compute server. It has special support for LaTeX projects, including sophisticated translation to HTML for display within the wiki page.
Requirement Heap is a web based requirement management /business analysis application. It allows to enter requirement in rich text, supports versioning and the management of requirements. It also handles use cases, interviews and test cases. It allows multiple projects. Stakeholders and glossaries can be handled per project or globally.