Tech experts collaborating for change   

• Geeks Who Care, Australian based group: Facebook page, Forum.
• GeekCorps^W - sends people with technical skills to developing countries to assist in computer infrastructure development.
• Saving the world, one line of code at a time, Google Lat Long blog, November 12, 2009
• Global Swadeshi[1] - a network focused mainly on open tech for hardware; however the network includes software developers.

Please add other organizations and networks to this list.