Lightning Calendar - Organize your life — it’s about time!
Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Calendly for Chrome - Schedule meetings without leaving your inbox
GMinder - GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.
Polymail Calendar - Schedule meetings instantly over email