I have come across a site for your needs Maps and Software. Came across it as I have just purchased a Chinese GPS. I have Garmin, iGo Primo and OziExplorer installed and running. They do not have the OziExplorer stuff on that site you need to go to the OziExplorer site.
The only downside with OziExplorer/OziExplorerCE that I have so far come up with (apart from learning how to use it) is you need to use the Chinese GPS units like a Hema Navigator. The instructions for that can be found HERE