So we created bugfreak used a couple of weeks and then opensourced it:
https://github.com/agilefreaks/apibugfreak - the api and web app, same app as www.bugfreak.co so you can fork it and deploy it on your own server
https://github.com/Agilefreaks/winbugfreak - the .net clients (wpf, silverlight, aps mvc)
https://github.com/Agilefreaks/droidbugfreak - the android client
All packages are available in nuget and maven
As always PR are more than welcomed. Let us know what platform you want to have support for next (rails is already on the roadmap)