I'm a software engineer, and I want to volunteer my abilities in a foreign country for a month or two, preferably for a charitable organization. I previously did some work for the Grameen Foundation in Ghana, which I very much enjoyed, but haven't been able to find any resources to plan my next trip.
I've seen the questions Volunteering opportunities when travelling overseas and Website resources for 'out there' jobs related to travel. However, I'm not looking to get paid, and I'm not looking to "tour" as I volunteer in the country.
Are there any websites where I can get access to these types of opportunities?