
The Gizmoplex is a streaming service run by Satellite of Love, LLC. It is the current home of Mystery Science Theater 3000 and was partially funded by a Kickstarter campaign that also financed the production of Season 13 and numerous shorts and specials.
It is built on the same infrastructure as the VHX service and users with VHX accounts can use the same credentials to access the Gizmoplex.
Behind-the-scenes[]

Front page of the Gizmoplex
The Gizmoplex was created to allow Joel Hodgson and his production team a place to debut new MST3K material without the risk of interference from a network or streaming service.
There is an in-universe equivalent and the streaming service is referenced directly on the show.