I made a list of these recently, here are a few that come up often.

Slack for communication

Trello for project management

Github for engineering workflow

1Password for password security

Google Docs for document collaboration

Quip for document collaboration

Hellosign for legal contract signing

Helpscout for customer support

Donut for culture-building

Small Improvements for feedback

Lever for hiring

World Time Buddy (to manage timezones)

Typeform for feedback and surveys

Zoom for video chat

GSuite for spreadsheets & email

Zenefits for HR

Discourse for searchable communication

Okta for password management

OfficeVibe for team surveys and check-ins

CultureAmp for career growth

Zoom for video calls

Groove for customer support

World time buddy to see people's timezones

Teamweek for high-level team tasks

I'll throw in a plug for Holopod - it's a Slack add-on that improves visibility and communication for remote teams through automated status updates and message queuing.

The full list is here: https://holopod.com/blog/remote-work-team-tools