Hi Pricto,
Here a few frequency ranges of a few modules, at the end it's a matter of checking all the manuals of those modules you might be interested in :-)
Erica Synths - Black LFO - 0.1 Hz - 60 Hz
ACL - QLFO - "a fraction of a" 1 Hz - 20 kHz (I am just phrasing what has been mentioned in the manual)
AJH Synth - Dual LFO & VCA - in slow mode it's 0.01 Hz - 2 Hz
Doepfer - A-145 - Standard LFO but I love this thing and have a look at this copy/paste from Doepfer's website:
H: about 10Hz - 4.5kHz
M: about 0.1Hz (10 seconds period) - 50Hz
L: about 0.005 Hz (3.5 minutes period) - 5Hz
How slow do you want to go? :-)
Instruo - Ochd - 25 minute cycle till 160 Hz (even slower than the above Doepfer)
IO Instruments - Themisto VCO but can go from 0.5 Hz - 6 kHz or from 10 Hz - 130 kHz
Joranalogue - Generate 3 - VCLFO mode 0.0028 Hz - 180 Hz
Make Noise - Maths - from 25 minutes up till 1 kHz
Well that's what I could come up with in checking about a half hour the manuals from several manufacturers. Perhaps there are already one or two modules that might interest you otherwise just keep checking all the manufacturers and their manuals :-)
Good luck in finding the right LFO and kind regards, Garfield Modular.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads