from Buffer. They use:

Slack — Great for real-time instant messaging
Dropbox Paper — Collaborative documents that we can edit and share asynchronously (another favorite: Google Docs)
Zoom — Our go-to for video conferencing, team-wide calls, and 1-to-1 conversations
Trello — Project management and team organization. All our tasks and campaigns go here.
Gmail — Email (obviously!). We use a Gmail setup that allows every email to be transparent and visible company-wide
OfficeVibe — This Slack add-on helps us stay abreast of company morale
Timetastic — Keeps us aware of teammate vacations and days off
Discourse — A forum where we share announcements and news
Zenefits — Our HR dashboard and portal
Expensify — How we easily expense things...

from Buffer. They use:

Slack — Great for real-time instant messaging
Dropbox Paper — Collaborative documents that we can edit and share asynchronously (another favorite: Google Docs)
Zoom — Our go-to for video conferencing, team-wide calls, and 1-to-1 conversations
Trello — Project management and team organization. All our tasks and campaigns go here.
Gmail — Email (obviously!). We use a Gmail setup that allows every email to be transparent and visible company-wide
OfficeVibe — This Slack add-on helps us stay abreast of company morale
Timetastic — Keeps us aware of teammate vacations and days off
Discourse — A forum where we share announcements and news
Zenefits — Our HR dashboard and portal
Expensify — How we easily expense things across the team

see: https://open.buffer.com/remote-work/