Here are links that we like

http://www.amref.at/

http://www.amref.org/

http://www.samaritan-village.org/

www.volunteer4africa.org Volunteer 4 Africa provides free and low cost volunteer work opprotunities throughout Africa.

http://www.outdoor-unlimited.at/de_index.html

http://www.tanzania.at/

The beach crab resort, Pangani