It's name is IvyExec; it is on LinkedIn; but I am not so sure about their power as it is more or less corporate oriented. Check it out.
There is, of course, a string - you have to give them credit card so after trial they Will charge you automatically.
What we all need is a good agent, even if he takes some percent of sallary. Unfortunatelly, I didn't find one yet.
RGDS, Mike