Free/Open alternative to MS Sharepoint?

[pll at lanminds.com]

Hi all,

Is anyone aware of an open/free alternative to MS Sharepoint Portal 
Server?  Or, to re-phrase, is anyone aware of a web-based 
documentation control system which will run under Apache, and has the 
capability of allowing files to be checked in/out (considering that 
MS Office docs would be considered a binary format :(

Thanks,


-- 

Seeya,
Paul
--
	It may look like I'm just sitting here doing nothing,
   but I'm really actively waiting for all my problems to go away.

	 If you're not having fun, you're not doing it right!