FT2 is a terrain generator that outputs maps in CC2 format that can then be edited in CC2 or CC3 (with the limitation that some CC3 features do not work well the CC2 maps generated by FT2; there is a way to convert the FT2-generated maps for CC3, however). FT3 will be out soonish and outputs CC3 maps directly.

FT maps serve as inputs to CC. FT cannot import CC maps for additional processing.