Cron - Cron Calendar.
Tability - Get your goals out of spreadsheets
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
ConectoHub - If Asana had a powerful OKR system
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Ricotta Trivia - Engage your remote team with some Trivia and Icebreakers on Slack. Run a quiz on Slack, answer Icebreaker questions or play games such as This or That, Two truths and a lie and more.