There are a number of Bug Databases that may be interested in this ontology. It would be useful to develop a D2RQ mapping for each of these databases. Here is a partial list:

• Bugzilla: one of the most widely used open source bug tracking systems: bblfish contacted them
• JIRA: A closed source bug tracking system which I have seen used on a number of open source software projects, such as Roller. Contacted by bblfish.
• Mantis Bug Tracker: open source (GPL) PHP-based system, with a fairly large feature list
• BugZero
• Issue View
• Problem Tracker
• Rally Software Development
• Fog Bugz
• Intland Software

Oops a full list is available on Wikipedia

Not listed at wikipedia:

• tracker from w3.
• simple list simple list of bugs.