Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
BirthdayBot for Slack - Don't miss your teammates' birthdays!
Iventlist - Create an app for your event in minutes ๐๏ธ
Planniversary - Never forget a gift or a birthday / anniversary again ๐๐
sched - Event management software
Birthdays Reminder - So now you can finally delete your Facebook account