Nooku
Nooku is the brand new content translation and multi-lingual solution for Joomla 1.5
Nooku manages as many languages as you need. No hassle, no overhead. Translate content, urls, menus or extensions, all from your familiar Joomla!TM environment.
DOCman
DOCman is an open source Document Management System (DMS) for Joomla!TM 1.0 and 1.5.
With this component you can manage documents across multiple categories and subcategories and give users permission to upload, download or edit documents.