There are lots of different semi-synthetic water soluble coolants out there. I don't know as any of them are all that stinky when fresh.
I use Doall's Kool All 940 and have been fairly pleased with it. It doesn't smell too strong, even in mist.
Machine oils and oily cutting fluids mix with the coolant and, after a while, anything, and I mean anything will grow a bacterial slime skin. So, disinfecting of the coolant sump or tank is essential every time you change coolant. If you are lucky, you might be able to use a coolant for a month before it gets stinky, providing you have some kind of a skimmer operating to remove most of the oil from the surface.
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