How about SpeedFan ?
I don't post this under Asus Software, as it is a question about software from other providers.
Fan Xpert 3 doesn't work for me. It can't calibrate 2 of the fans and, seriously, I don't need software to tell me the limits of my fans, I know them very well. So, if Fan Xpert 3 can't be overridden, what other software is available?