Slack & Zoom & Email (& IRC) for comms.

Documents live somewhere between GitHub (engineering) and GDocs (everyone else). We used to have Dropbox Paper, which was nice, but apparently prohibitively expensive.

Almost all services auth via Okta. We've got a bastion host setup to access production servers and a few services that have bad/no authN (e.g. Kibana).

There's also JIRA (sigh).

I think we're mostly pretty flexible in terms of what people use, and lots of teams kind of do their own thing.