Zennström philanthropies
Zennström philanthropies has two strategic programmes designed to support Human Rights and the Environment.
Even if the Environment focus is the Baltic Sea, it is oriented towards cities it seems.
Norrsken
More relevant, check the following two supported projects:
WEFARM
Wefarm is a free peer-to-peer service that enables farmers to share information via SMS, without the internet and without having to leave their farm.
IGNITIA
Ignitia has developed a high-resolution tropical weather forecast model raising accuracy from 39% to 84%, which means that small scale farmers in the tropical regions can plan their farming a lot better. Better planning improves their farming yields and puts food on the table.