I am looking into toodledo to may use it to track times spend on projects. The timer function itself works fine for my needs but: How can I report the times spend on a project.
eg:
A list of selected projects with a sum of the time spend on the single task, idealy with customizable timeperiods?
It sounds like you are looking for a timecard or timesheet application with reporting functionality. This isn't in Toodledo's core competence. My suggestion is to use Toodledo for task management and use something like TSheets for timecard management. Tsheets even integrates a little bit with Toodledo: http://wiki.tsheets.com/wiki/Toodledo
a lot for your feedback, as freelancer I actually have a tracking system but I need to look for alternatives. Do you have a rough estimate when you may have updates available. I also can offer to volunteer for tests.