

The commercial implementation is also open source, but there is a a proprietary version aimed at large enterprise customers that adds better optimization for very large deployments, and better auditing and moderation tools.
See here for all the servers, clients and bridges can also be viewed from there: https://matrix.org/ecosystem/servers/







Yup, totally different, continuwuity and synapse are the main two, and although there are others, they’re just less good.