CyberTracker is a nonprofit organization which develops software as part of a larger vision. CyberTracker is most widely used in conservation, but it has also been successfully customized for a variety of other fields.
CyberTracker is freeware and is supported through donors and community funded features.
CyberTracker is supported by a Google group. The group is monitored by the CyberTracker team and has many knowledgeable folks asking and answering questions.