Zimplit CMS - The easiest Open Source Content Management System for small web- and minisites
Rock RMS - Rock RMS is a community supported open-source Church Management System that provides innovative features to churches of all sizes.
BaferCMS - The fastest and the easiest way to edit content "in-place", while looking at the website.
ChurchSuite - ChurchSuite is a cloud hosted, web-based church management system, ideal church database software for churches.
Nibbleblog - Nibbleblog is a powerful engine for creating blogs, all you need is PHP to work.
eCatholic - eCatholic provides a total content management system that helps Catholic parishes, ministries, & dioceses create websites & website design.