Looking for an online collaboration software for five members?

We are looking for an online collaboration software for five members. Currently we are using Wikispaces, but it does not have any method of schedule management. Probably, it’s just not intended for corporate use. Has anyone encountered the same problem?

Linux Foundation Announces 2010 Event Schedule, Posts Call for Participation for Annual Collaboration Summit

Linux Foundation Announces 2010 Event Schedule, Posts Call for Participation for Annual Collaboration Summit
SAN FRANCISCO, CA–(Marketwire – January 19, 2010) – The Linux Foundation® (LF), the nonprofit organization dedicated to accelerating the growth of Linux, today announced that it has finalized its event schedule for 2010, which includes its Collaboration Summit, End User Summit, LinuxCon, [...]