RT has many interfaces for creating and updating tickets. A web interface is available for both logged in users and guest users. It is easily tailored by granting or denying specific permissions to users as well as by adding custom fields and data to tickets. Template callbacks allow the modification of the software’s web pages without requiring extensive knowledge.

Email is another primary interface to RT and is often the only interface many guest users see. The email system includes support for auto-responses, attachments, and full customization of the rules which govern to whom and when email is sent. Emails are stored in RT as correspondence on a ticket, and the software can make a distinction between public replies and private comments to show them as appropriate.

A full REST API and a command-line tool are also provided as another way to interact with RT.

Trac allows hyperlinking information between a computer bug database, revision control and wiki content. It also serves as a web interface to the revision control systems Subversion, Git, Mercurial, Bazaar, Perforce and Darcs.

Other features include:

- Project management (Roadmap, Milestones, etc.)
- Ticket system (bug tracking, tasks, etc.)
- Fine-grained permissions (since 0.11)
- Timeline of all recent activity
- Wiki (syntax similar to MoinMoin)
- Customized reporting
- VCS web interface
- RSS Feeds
- Multiple project support
- Environment extensibility (via Python plugins)
- iCalendar export[4]
- Multiple Repository Support per environment (since 0.12)
- Interface localizations (since 0.12)

Key features include:

- Web and Email Suppport: Tickets can be created via email, online forms or phone (created by staff). Flexible configuration and mapping.

- Auto Response: Automatic reply that is sent out when a new ticket is opened or a message is received. Customizable mail templates.

- Canned Replies: Predefined responses for frequently asked questions.

-Internal Notes: Add internal notes to tickets for staff

- Help Topics: Configurable help topics for web tickets. Route inquiries without exposing internal departments or priorities.

- Alerts and Notices: Staff and clients are kept up to date with email alerts. Configurable and flexible settings.

- Role-based Access: Control staff’s access level based on groups and departments.

- Assign & Transfer Tickets: Assign tickets to a staff and/or department.

- No signup Required: No user account or registration required for users (ticket ID/email used for login).

- Support History: All support requests and responses are archived.

Bugzilla can help you get a handle on the software development process. Successful projects often are the result of successful organization and communication. Bugzilla is a powerful tool that will help your team get organized and communicate effectively.

Bugzilla helps reduce downtime, increase productivity, raise customer satisfaction, and improve communication. Bugzilla can also help reduce costs by providing IT support accountability, telephone support knowledge bases, and by keeping tabs on unusual system or software issues.

Amongst its principal features are the following:

* Optimized database structure for increased performance and scalability

* Excellent security to protect confidentiality

* Advanced query tool that can remember your searches

* Integrated email capabilities

* Editable user profiles and comprehensive email preferences

* Comprehensive permissions system

* Proven under fire as Mozilla’s bug tracking system

The software is written in HTML and ASP and can be easily modified and customized.

The Key features of Liberum Help Desk include the following:

* Completely web-based, E-mail notifications

* Can utilize Windows authentication, so you don’t need to manage another database of users

* Allows for better communication between users and support reps: users can view progress on problems and submit additional information

* Built-in reporting to keep track of support reps, which departments are making requests, and what types of problems are being reported

* Easily customizable to fit your needs