These are just a few of the tools that help us work together, even when we aren't all in one location. Caveat, the apps, AFAIK, are Mac specific.
A alternative list of techs that'll help (imo, despite being nothing like yours):
> IRC
> XMPP
> Skype (alternatives welcome)
> Vagrant
> Favourite bug / productivity app.
> Your favorite wiki (if in doubt, use mediawiki)
> VPN (assuming you have need to connect to the office, you probably don't if you're using github type resources)
> Git
Basically, all the same stuff that'll help you work even if you're in the same office. I've worked from home for over 3 years, the #1 problem for me is the people in the office who don't use these tools.