1. OpenDocMan
OpenDocMan is a web based document management system (DMS) written in PHP designed to comply with ISO 17025 and OIE standard for document management. It features fine grained control of access to files, and automated install and upgrades.
2. Freeplane
Application for Mind Mapping, Knowledge Management, Project Management. Develop, organize and communicate your ideas and knowledge in the most effective way.
3. LogicalDOC Document Management - DMS
LogicalDOC is a modern document management system with a nice interface, easy to use and very fast. It uses open source Java technologies such as GWT, Spring, Lucene in order to provide a flexible and scalable DMS solution. http://www.logicaldoc.com
4. BlueSpice
This freely available open-source software turns Wikipedia's popular software engine MediaWiki into a fully-fledged enterprise wiki solution. Companies can continue cherishing MediaWiki's numerous advantages and automation capabilities; with BlueSpice, they can now work even more comfortably, safely and more effectively. Compared with basic MediaWiki, BlueSpice provides, amongst other, the following enhancements: comfortable and sophisticated rights management capabilities, a visual editor (WYSIWYG), easy image - and file upload, workflows. Further information with respect to the management and administration of your wiki: BlueSpice is free, open source und not subject to any restrictions with regards to the number of users. There are no licence fees or other additional costs, no matter how many employees are using the software. Existing content is not changed or lost when installing BlueSpice. BlueSpice is simply installed on top of your existing MediaWiki.
5. Plandora Project Management
Including: time track, request management, customized reports (based to iReport), customized KPIs, dashboard gadgets, knowledge base, risk management, costs and budget management, agile board, resource capacity, surveys, SVN integration, and Gantt chart. The tool also includes: extendable agents (email notification, audit agents, etc), meta fields and custom forms.