The Bug Genie is a user-friendly and powerful web-based (PHP5) bug tracker/bug tracking tool with features such as project management, SVN integration, publishing tools, messaging, calendar and more. Ready to use out-of-the-box, and easy to install.BugTracker.NET
BugTracker.NET is a free, open-source, web-based bug tracker or customer support issue tracker written using ASP.NET, C#, and Microsoft SQL Server (or its free cousin, SQL Server Express). It is in daily use by thousands of development and customer support teams around the world.Bugzilla
Bugzilla is a "Defect Tracking System" or "Bug-Tracking System" that was originally developed by Mozilla to assist in their development. It allows individuals or groups of developers to keep track of outstanding bugs in their product effectively. Bugzilla is "free" and has many features such as: Bug Lists in Multiple Formats (Atom, iCal, etc.), Scheduled Reports (Daily, Weekly, Hourly, etc.) by Email, Private Attachments and Comments, etc.Flyspray
Flyspray is an uncomplicated, web-based bug tracking system for assisting with software development, written in PHP.It can use either MySQL or PGSQL, File attachments, CSS themes, Atom/RSS feeds, etcGemini
Gemini is a commercial product that offers a free 3 user license. Gemini is a leading .NET based project management platform that provides an effective browser-based project team experience regardless of roles, locations and project types. Key integrations with Microsoft Outlook, Microsoft Visual Studio, Subversion and other leading configuration management systems.Mantis
Mantis is an easily deployable, web based bugtracker to aid product bug tracking. It requires PHP, MySQL and a web server. It is simpler than Bugzilla and easily editable. Check out the online Demo.Redmine
Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database. Redmine features multiple project tracking, custom fields for issues, time-entries, projects and users, users may have different roles across several projects, email and feeds.Trac
Trac is an enhanced wiki and issue tracking system for software development projects. Trac uses a minimalistic approach to web-based software project management. It provides an interface to Subversion (or other version control systems), an integrated Wiki and convenient reporting facilities.