CoreUM - The Ultimate Meeting Application
Toolbox // Outils gratuits en ligne @NumerOOs
Polymail — Email Tracking, Templates, Send Later, and Calendar Integration
Cal.com | Open Scheduling Infrastructure
Calendly - Scheduling appointments and meetings is super easy with Calendly.
PeachPay - Monetize your Content
Easy!Appointments – Open Source Appointment Scheduler
Create your own polls - Terminplaner 4.1
Meetsy