Is there any service similar to slack, but in Russian and with guest access?

Question

Software and Internet Services

Is there a service that allows you to organize communication and file sharing like in slack, but in Russian? It is necessary to organize a communication channel with the client of the web studio. Those. on our side, a team or manager, and on the client side - guest access, communication, file sharing.

Answer 1

Flock - in Russian, but does not support as many integrations as Slack.
Plus, it's not that common.
And now in Slack channels can be called Russian names, which, by the way, is very convenient.

Answer 2

Telegram? Bitrix24?