My team and I have been using AirSend for quite some time, and it really is a one-stop-shop alternative to Slack, Zoom, and other similar software we've tried in the past.
Frankly, I don't know how I lived without it before. It rolls everything you could ever need into one clean package -- productivity tools, voice/video calling, file storage, software integration, and (most importantly to some of us, hah) the beautiful minimalist interface.
Highly recommend AirSend for any organization, especially teams still stuck in the remote-work rut because of COVID. It's free too right now, so definitely give it a try!