Atlassian Confluence $5 for 5 users
atlassian.com
atlassian.com
Confluence has traditionally free for open source projects. I upvoted this because I think this limited-time offer ($5 for 1 year) would fit many small, distributed startup's needs for a centralized knowledgebase (if they are not already using Drupal or Backpack). Jira is also included in this $5 offer too [separately - not 2 for 1] (we use that too - our testers/business analysts love it)
Really? They do? That's surprising, because the last 3 places I've worked with Jira, everyone hated it. I always felt like it was a super-configurable, really lame to use issue tracker.
Personally I love Jira, it's easy to configure to work the way you work, it has tons of plugins, great integrations (Eclipse, Hudson, SVN). It's by the best task/bug/project management tool I've every used.
It has a ton of excellent features and polished interface out of the box, but the real strength is the ecosystem of plugins available for Confluence that let you easily extend it to be tailored to your needs.
With a deal like this, I'd recommend checking it out.
But Atlassian are a very marketing-smart company, so maybe this is intentional, to generate discussion, and so make the message more sticky.
A quick reading of the FAQ (which you should always do to avoid surprises :)) clears up all doubt.
BTW, thanks to the submitter. We use this at work and it's fantastic. I really wanted to be able to use it for my personal projects, too!