Omnigator is a web-based Topic Maps browser which can display any topic map. It is not intended as an end-user tool (although some have used it as such), but is more of a developer support since it can be used to view any part of any topic map. One user referred to it as a "Topic Maps debugger", which is quite accurate, but it is actually more than that, since it can be used to run tolog queries, validate topic maps, get size statistics, etc.