What's the killer remote-work toolkit?

With all of the measures in place for Coronavirus, I've shifted to a full-time remote schedule for the first time in my career. Our company supports remote pretty well, but this is the first time we've been mostly remote. Doing this for more than a few days starts to highlight our weak spots.

So I'm curious, what is your remote working kit? What are you using for email, chat, white boarding, file storage, video conferencing, etc, and how well is it working?