ManualsLib - Just enter the keywords in the search field and find what you are looking for!
phpMyFAQ - phpMyFAQ is a world’s most popular mobile-friendly, feature-rich and open-sources FAQ software that uses PHP 5.
Manuzoid - Repository that includes user manuals for various products
iService - iService is an integrated solution for managing all customer interactions with complete web-based interface, routes and automatically responds to customer email, provides a simple but powerful knowledge base, and includes a complete contact manageme…
ManualAgent - Manuals and guides
Phaseware Self Service Center - Self Service center allows incident submission, access to knowledgebase, FAQs, and crowdsourcing through forums and communities.