There are none that support M-TTL, so you are dependant on ringflashes that have an auto mode. Sunpak and Star supply those. The adapter rings supplied will probably not fit the smaller Leica M filter sizes, so you will have to buy extra step-up rings. Heavystar (e-bay) has a large range of those.
Any studio ringflash (profoto - hensel - balcar) will work with the M size-wise. Just the usual caveats of using an M with a studio flash apply (sync speed, etc.)
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