RainFramework is an MVC Framework for PHP. It's easy to use and it enables teams to work better. It is installable with a simple copy/paste operation. It has a very small footprint, with just the necessary library and files. It is well documented and tested, and it allows you to create Web applications more quickly. It also supports multiple languages, has a WYSIWYG editor, and is extensible.
AldoContent is a lightweight CMS focused on usability and simplicity. It is designed for multilingual Web sites and can have sections with public and private content. It has file management, is extensible with plugins, and uses gettext for localization. Is written in PHP for a MySQL backend.