For RDFT there is really only one generally available answer, DIGTRX, unfortunately it does not run under Win 10. It runs OK under XP, and with Win 10 I have had decent luck running it under XP in a virtual machine, this is a bit hit or miss though.
FSK and RTTY come down to the same mode in general, although you might have to be a bit more specific on what kinds of FSK and RTTY you want to work with. FLDIGI works for many of these signals, however you might have to set up custom configurations for the various types.
MMSSTV is the easiest free software that does SSTV, although I have never tried to run it under Win 10.
And for CW, again FLDIGI does a decent job.
T!