pdf2oo converts pdf to odf. It creates an image for each page, allowing to overlay drawings and text and export it back to pdf. Handy for rewiews of scientific papers. The closest thing to a free pdf editor, "almost" an openoffice pdf import filter.
A Wysiwyg Wiki in php/mysql. Features are : wysiwyg online editor (Xinha), user management, lock system to avoid 2 users editing a page at the same time, file management (attachment), image management(upload+online modifications), versioning...