What web apps can help us to build support section in our company website?

We need something that have forum,online support(chat),knowledge base(or wiki),Help desk. What's best web app for this?

From web app Hameds

• • Forum & Online support: UserVoice or GetSatisfaction
  • Knowledge base: See this comparison

  You could also just use the online support app as a knowledge base by creating articles in the style of an FAQ.

  Mike Sherov : I can't upvote GetSatisfaction up enough!

  Evan Plaice : +1 for GetSatisfaction
  From Simon Brown

• Also check out Zendesk. They integrate with many other web apps.

  From Jeff Epstein

• I believe SharePoint 2010 would be a good fit. It depends a lot on what the current environment at your company looks like.

  Prestaul : I totally disagree. Besides being too general in scope and challenging to configure and maintain, SharePoint sucks as a forum and offers no chat. You are better off with a tool designed as a help desk/support forum.
  From Woot4Moo

• I also think there are two related options: SnapABug and Olark

  Both apps allow the user to chat with a live admin (assuming you are present). They both integrate with several chat apps. Although neither is a complete solution, they are both valuable dealing with customers (and offer free accounts).

  From Jeff Epstein