Cron - Cron Calendar.
LiquidTime - Smite procrastination. Plan, allocate, and track your time by making every task fit.
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
Gooba - Writing app and task manager.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Valheim - Valheim is an Action-Adventure, Historical, War, Strategy, Single-player, and Co-operative Multiplayer video game by Iron Gate B.