WebIssues is a multi-platform system for issue tracking and team collaboration. It can be used to store, share, and track issues with various attributes, description, comments, and file attachments. It is easy to install and use but has many capabilities and is highly customizable. Desktop and Web clients are provided.
VisionProject is a powerful Web-based project management tool and issue tracking system that also includes modules for helpdesk/support, time management, document management, and much more. VisionProject is built to be easy to use and customizable. The extensive functionality offered includes drag-and-drop, search possibilities also within the attached documents, sub-items, a Web portal for external customers, support for popular concepts used in project management and IT service management, such as ITIL, Scrum, Lean, Waterfall, etc.
Redmine is a flexible project management and issue tracking Web application. It supports multiple projects, flexible role based access control, Gantt charts and calendars, news, document, and file management, feeds and email notifications, per-project wikis and forums, time tracking, custom fields for issues, time entries, projects, and users, SCM integration (SVN, CVS, Git, Mercurial, Bazaar, and Darcs), issue creation via email, multiple LDAP authentication support, user self-registration support, multi-language support, and multiple database support.