From the CivicSpace Blog.
We think anyone should be able to create a Kiva or Global Giving style site for their social change project without having to pay for rebuilding the same basic technology over and over. Ultimately, we want to allow anyone to launch a Kiva or Global Giving style site for a low monthly fee with open source software (Drupal/CiviCRM).The benefits of open source is that you can focus on the mission and share the costs of the technology, building a community of folks supporting social change.