There is a rather confusing mess of flashgun+wireless sets sold under various brands (eg Godox, Neewer,....), usually described as preflash/digital-TTL capable for a certain camera platform.
Can any of these systems actually be used with multiple platforms (as off camera, radio interfaced flash - but with TTL integration - only, not by direct or wired hotshoe connection, not by optically controlled wireless TTL) by merely getting all the various transmitter units and only one set of flashguns, even if they are not officially sold this way?