MathHub.info is portal for active mathematical documents and archive for flexiformal mathematics. It hosts most MMT content in the form of math archives and makes it accessible to human readers in the form of active documents.
MathHub stores its contents in the GitLab repository http://gl.mathhub.info and provides mathematical knowledge management services and presentations via a dedicated MMT process.
The MathHub Wiki gives details about the system.
Archives can be installed and updated from as well as published to Mathhub using the Local Mathhub Tool (LMH). In addition Mathhub hosts an MMT-server and an instance of TGView to explore and visualize archives.