I have a software consulting firm in Malaysia and we use google hangouts, Skype, GitHub, and a cloud hosted CI setup to run all of our projects. We have a team

I have a software consulting firm in Malaysia and we use google hangouts, Skype, GitHub, and a cloud hosted CI setup to run all of our projects. We have a team that spans from south america to Australia and it works fantastically well. The key for us is our daily SCRUM meetings, always on Skype chat room and a rule that everybody must commit and push something at least once a day. This works beautifully for us and the people that we work with often really enjoy the experience. Also since we span time zones we have a couple Brazilian developers that work while the rest of us are asleep (but they do show up for the daily SCRUM meetings). This actually turns out to be really helpful sometimes when we have a hard deadline as we can effectively work round the clock. For our company remote working is the only way to go.