A lightweight, easy to use PHP content management system (CMS). Written to be fast and to use as little memory as possible. Placeto CMS offers browser and server caching, provides gzip compression and to cut down on bandwidth and CPU time.
Quosis Platform is an communication and information management platform for distributed enviroments and collaboration beyond organizational borders.
doXuMenTal - A lightweight XML and XSL to XHTML system that uses Xalan to create websites and documentation.
yalCMS (Yet Another Lean Content Management System) is a CMS especially intended for small, private websites running on a private or hosted server. Its main target is to provide an easy-to-use technology, so that everyone (even my mum) can use it.