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For those interested, it's likely smcFanControl - https://github.com/hholtmann/smcFanControl

Doesn't turn the fan off but I found Temperature Gauge App to be very helpful in terms of monitoring what is going on with the fan and temperature.

Looks like they have another app which does have fan control:

I feel I can't live without it.

That's not the one I had, but it looks better - thanks!