Navigator - The Teamwork assistant — run great meetings without busywork
Button for Google Calendar™ - See your daily schedule and join meetings in one-click.
Standup Bot - An easy to use bot that automates your team’s standups, check-ins or any kind of recurring status update meetings, without breaking the bank.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Sprout - When HP’s Sprout Pro was introduced in 2014, everyone saw the possibilities.
Calndr.link - Dead simple & free add to calendar links + API