The most popular open source bug tracking tools I know of are Bugzilla, Mantis, Redmine, maybe Trac. I am sorry, I am not familair with "one tool"; it sounds more like an expression ("we should find one tool for our whole company") not the name of an actual tool.
Defect management open source tool - "One Tool"
I recently heard about an open source tool called "One Tool". It is basicalled a defect management tool. Need more details on it. Can someone help? You may point to any links that should be fine too.
I've been searching for this 'One Tool' as well (that almost sounds like a Tolkien story by the way) but couldn't find anything.
As Matt said, there are some pretty decent open source defect management out there (I'd go with either BugZilla or Mantis). What feature was in that One Tool that wasn't present in any of the other open source tools?