Free editor for PDF documents. Complete editing of PDF documents is possible with PDFedit. You can change raw pdf objects (for advanced users) or use many gui functions. Functionality can be easily extended using a scripting language (ECMAScript).
Create and edit SVG graphics directly in ownCloud. Based on svg-edit.
This project provides an ownCloud-app (http://apps.owncloud.com) for editing and creating SVG vector graphics in your browser. It's based on the awesome "svg-edit"-project (http://code.google.com/p/svg-edit/). Features like collaborative editing may be implemented later.