Google tells me that there are a fair few companies that offer hosted Trac and Redmine. So far I have tried Assembla who provide Trac hosting for free, but they don't allow plugins. I am prepared to pay for a managed solution, but we need it to have support for plugins, and it needs to be responsive when accessed from most places in the world (since we're an open source project).
We have investigated hosting it ourselves, but it's incredibly difficult to get good peering on cheap virtual servers, and we can't afford to go with fully-fledged dedicated hosting. We could try Geo-dispersed self-hosting on cheap servers, but we want to focus more on development than website administration.
Again, I can't emphasise enough my two requirements:
- Must support plugins
- Must be very responsive