general knowledge

WebPlus SE: Design professional websites for free. No HTML knowledge required!

Adobe RoboHelp: Easily create professional help systems and knowledge bases.

You can get specific information about this update in Microsoft Knowledge Base.

Customer Service Software by LiveHelpNow, chat, ticket, email, knowledge base

Stash is a tiny, free-form knowledge base that's easy to use for folks on the go

Guitar lessons for intermediate/advanced level: no musical knowledge required

Guitar lessons for absolute beginners: no musical knowledge required

Easily build Flash Tutorials with no knowledge of Flash and it is FREE to start

Kplan is a knowledge management software which helps you organize your life

Free mind mapping program and knowledge management system