Jethro PMM helps church leaders track people, families, pastoral tasks, groups, attendance, services, rosters and documents via an easy-to-use web interface. It doesn't force you to work a certain way, but gives you lightweight, flexible tools to support your type of ministry.
March 2012: Jethro v2.3.2 has been released, with various bugfixes and some small new features. Thanks to Keith and Tim from Macquarie Anglican Church in Sydney, Australia for contributing new features in this release.
Feb 2012: Jethro v2.3 has been released. New features include support for photos, special dates and action plans which automate certain tasks. Thank you to St Peter's Woolton in the UK for sponsoring development of these new features.
Jethro is free and open-source (GPL) and runs on a standard LAMP web server.
The advantage of web-based church management is that church leaders can all access the system no matter where they are working from. However if you really want to run Jethro on a single PC, this can be done using XAMPP
Jethro was initially sponsored by Christ Church Inner West Anglican Community and is now used by many churches in Australia and beyond. You can read a review of Jethro on the Communicate Jesus blog.
Questions and feedback are welcome.