GetSimple is an open source Simple CMS that utilizes the speed and convenience of flat file XML, a best-in-class UI and the easiest learning curve of any lite Content Management System out there.
Many available extensions or plugins available. Custom programming may not be necessary.
User-friendly and easy to use, and offers easy management of content and data, with a minimal learning curve. No prommaning knowledge is necessary.
Has a smaller active community. Limited support is available either for free or as a paid service. Adequate documentation is available.