wiki software

[robot180]

Sorry if this was already posted, I searched but didn't find much.

My team would like to set up a wiki on our website for us to use to colaborate and share software for our software team. We have a message board, however a wiki would make it easier to share software and allow us all to work on the software and keep an updated copy there.

We would like some free wiki software, if some exists, but I am not sure which wiki software is best and where to get it.

Does anyone have any suggestions for which features to look out for, suggestions of which software to use, or ideas of alternatives for doing this same thing? Thanks.