<p>What is a good free/open source alternative to <a href="http://en.wikipedia.org/wiki/WebFOCUS" rel="nofollow noreferrer">WebFOCUS</a>? </p>

<p>Is there an ASP.NET way of getting info from an OLAP cube?  </p>

<p><strong>Update:</strong> I chose Magnus Smith's answer as the correct one, but <a href="https://stackoverflow.com/questions/145322/webfocus-is-there-a-freeopen-source-alternative#145467">Alexmac's answer</a> was also very good!</p>

I am not aware of free analytical suite. But what is it you are trying to accomplish?
You can query an OLAP cube by using MDX queries with ADO.net.
http://msdn.microsoft.com/en-us/library/ms144785.aspx
You can then bind the results to a datagrid for example. MDX is a little like SQL but be careful as it has several syntax differences. I think Excel has a query tool you can use to graphically construct your queries which can be helpful.
On a related note look into SQL reporting services. With SQL express you can use a cut down version of sql reporting services that may accomplish what you are looking to do.