Cronofy - Unified Calendar API for developers
Houseparty - Brining empathy to online communication.
ApPHP Calendar - ApPHP Calendar is a PHP calendar script that may be easily integrated and used with various PHP projects, such as schedulers, event, etc.
Squad - Screen share with friends from a group video chat ✨
Calendarix - Calendarix is a powerful and easy to use web-based calendar that runs on PHP and MySQL.
Airtime - Hang out with group video, share music & videos