We have compiled a list of five best and free issue tracking apps and software. These bug and issue tracking apps helps both developers as well as team of developers to debug their project and also use them as project management apps.
1. Bugzilla

Image: Bugzilla
Features:
1. Email Notifications Controlled By User Preferences
2. Bug Lists in Multiple Formats (Atom, iCal, etc.)
3. Scheduled Reports (Daily, Weekly, Hourly, etc.) by Email
4. Reports and Charts
5. Automatic Duplicate Bug Detection
6. File/Modify Bugs By Email
7. Time Tracking
8. Request System
9. Private Attachments and Comments
10. Patch Viewer
11. Move Bugs Between Installs and many more
2. Trac

Image: Trac
Features:
1. Integrated Wiki and convenient reporting facilities.
2. Allows wiki markup in issue descriptions and commit messages
3. Provides wiki and integration to subversion
4. Written in Python
3. WebIssues

Image: WebIssues
Features:
1. Open source, multi-platform system for issue tracking
2. The Desktop Client application can run naively on Windows, Linux and OS X
3. The Web Client can be used to access the system using a web browser
4. The server can be installed on any host with PHP 5.2 or newer and MySQL, PostgreSQL or SQL Server and many more.
4. Mantis Bug Tracker

Image: Mantis
Features:
1. Open source system for issue tracking
2. Time tracking
3. Custom fields and workflow
4. Works with MySQL, MS SQL, and PostgreSQL
5. Multi-level hieararchy structure
5. The Bug Genie

Image: The Bug Genie
Features:
1. Open source system for issue tracking
2. Automatic timeline feature
3. Automatically generated road-maps
4. Complete issue type scheme support
5. Easy issue editing and many more
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