Hello. I am Charles Gatama (cgatama of GitHub), a Kenyan based in Africa! I've been using ODK since 2011 to develop data management systems for different organisations using the ODK tools, to field surveys for different projects across Africa. I have implemented projects in the Kenya, Rwanda, Uganda, Zambia, Somali and Botswana. I'm also a Freelancer ODK developer (Java and python Dev as well); assist(ed)s clients to fork the odk collect repo and customized it to add features to meet their data collection needs. I've been involved in authoring large complex forms for different studies across Africa with different organisations; to name just a few, ILRI, Population Council, Intra Health, ECOPAD (JICA funded project in Rwanda), CIP etc.
I also hold training sessions on ODK for organisations as well as individuals eager to learn about ODK tools.