Mobile Data field collection software

I am looking for anybody who understands the following Mobile Data collection Platforms, Magpi ([login to view URL]), Datawinners ([login to view URL]), Viewworld ([login to view URL]),Epicollect ([login to view URL]), Kobotoolbox ([login to view URL]) I need mobile data collection forms to be designed, most of the se platforms have skip logic built in, but I need to it to be able to housed on my own server!