I thought we could use a central place to list and discuss the various MX-style RGB switches currently on the market in keyboards. Here are the ones I have found so far:
Note: This list not guaranteed to be complete.
Kailh:
Stem Varieties: Red, Brown, Blue, Black, Razer Green, Razer Orange
Used in: Razer Blackwidow Chroma, Keycool Hero RGB, V-OX G11, Hansung MKF10 RGB, Tesoro Lobera Supreme, Tesoro Excalibur RGB, Rosewill RGB80, QPad MK-10, Xenics M10TFL, QPad MK-90
Cherry:
Stem Varieties: Red, Brown, Blue
Used in: Corsair K65 RGB, K70 RGB, K95 RGB

Note: Blue stem MX-RGB may be hard to find, as Corsair has stopped using them due to low yield.
Greetech:
Stem Varieties: Red, Brown, Blue, Black
Used in: RK RG928 RGB
Gaote, a.k.a.
Outemu:
Stem Varieties: Red, Brown, Blue, Black
Used in: FL-Esports GT104 "Armor", E Element Z-77

Note: Available in a number of variants: all black plastic (but still compatible with RGB LED), translucent top with black bottom, or translucent top with white bottom. Sometimes referred to as "GT" for Gaote, other times as "OTM" for Outemu, but these appear to be the same company. GT104 uses the translucent-top switches, while E元素Z-77 uses the black-top switches.
Do let me know if you have any to add.