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This is not supported. Just looking at Matrix's website shows it requires custom inbound port (port 8448), a custom daemon (which has to be built from source), and shell access (maybe just for the install, but I didn't look far enough into it to tell if its needed for administration too), none of which we allow. You probably need a VPS to run this. It's not standard web software like a PHP or Python web application is. You can get a VPS for $20/month from a few places if you need a public server to host this on. If you want to learn it for free, download something like VirtualBox, install linux in a VM, and play around with it on your home PC. You can even host it from home if you don't mind setting up port forwarding (and possibly DDNS if you have a dynamic IP).