We use Pipedrive at Mixergy book more interviewees. Even though it's meant for managing sales funnels, I think it's helpful for any process where you have lots of prospects and a process for getting as many of them as possible to convert.
Michael, Pipedrive Inc is incorporated in the US with development and support office in Tallinn, Estonia. Founders are splitting time between SF and Estonia.
If you love Trello, you'll love Pipedrive -- it merges the functionality of CRM with the ease of use of Trello.