auto trade options with different underlies

Did you even look at the WEX platform I mentioned above?

In answer to your question here, MM's while use a variety of platforms. Some examples would be
Actant
Actant Trading Software
BTS
BTS Edge • Up Your Options Trading Game | Blue Trading Systems
Vela
Global Leader in Data and Execution Technology - Vela | Vela (tradevela.com)

These are three that I am familiar with and they will be a substantial amount of money.

I would guess the larger MM's would use proprietary software.
 
Which software companies develop proprietary software in the trading industry? Thanks.


Proprietary means that it’s their own internal software that we don’t know anything about. This usually includes all the secretive multi-billion hedge funds and market makers.
If you’re looking to create your own proprietary software and need developers, then Upwork is quite popular.
 
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