FullCalendar - FullCalendar is an open-source JavaScript event calendar.
TeamLink - TeamLink is one of the leading and sumptuous solutions that is making web and video meetings extremely easy and efficient.
Dudle - Dudle is an online scheduling application, which is free and open source.
Google Duo - Google's answer to Facetime, high-quality video calling on iOS and Android.
Mobile-Calendar - Reservation management system. If you rent accommodation, the mobile-calendar app was made for you!
Around - Find people to hang out with.