Should It Be a Meeting? - Fun and easy way to find out if you really need a meeting 🙌🏼
Cron - Cron Calendar.
Meetingbird - Powerful meeting scheduling and notes — right in your calendar
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
KosmoTime - The to do list with super powers
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.