Famedly

Famedly is a client intended for German healthcare. It is built with the matrix-dart-sdk, the same SDK used for FluffyChat. As such, it's not suited for regular users. However, if you really want to try it, there is a web client at https://app.famedly.de/. It messes with notification rules and probably shouldn't be used on a regular account. There are also Android and iOS apps, however those are only downloadable in Germany.