Billionth Second Birthday - Find the moment you'll have been alive for 1 billion seconds
Planniversary - Never forget a gift or a birthday / anniversary again 🎁📆
BirthdayBot for Slack - Don't miss your teammates' birthdays!
Slack Birthday Bot - Slack bot for celebrating birthdays
Cupcake - Keep track of your friends' birthdays
Birthdays Reminder - So now you can finally delete your Facebook account