Confluence is one of the best intranet wikis and fantastic for knowledge sharing and documentation, JIRA is a fantastic issue and project tracking tool, and other great tools from Atlassian
Each at $10 (+GST) for a starter (perpetual) license with 12 months support.
If you are a small team of developers even within a large company this is a must have.
$10 gets you…
JIRA 10 users
Confluence 10 users
GreenHopper 10 users
Bamboo 10 plans, unlimited local agents, 0 remote agents
FishEye 10 committers, 5 repositories
Crowd 50 users
Check out the FAQ here
http://www.atlassian.com/starter/faq.jsp
From their website
Our best tools are just $10 per product. Perfect for startups and small teams. Give your team the best tools for $10 and help us raise $1,000,000 for Room to Read.”
Full featured perpetual license
That's right, this ain't no watered down version. And no hidden fees either.Legendary support
A full year of support and maintenance included, and renewal for only $10.For a good cause
Helping the young entrepreneurs of tomorrow by donating to Room to Read.
Not to mention Atlassian is a great Australian software company to support.