From ALM Works:
Deskzilla Lite is a desktop client for Bugzilla (tm) bug tracking system, free for small projects with less than 1,000 bugs. It delivers features for better productivity and improved working environment for Bugzilla users.
It downloads bug information from Bugzilla and stores it in a local database. You can view and edit bugs and upload changes to Bugzilla. Additionally, it indexes all downloaded bugs, providing you with search capabilities and live statistical numbers.