Meetingbird for Gmail - View your calendar and schedule meetings right from Gmail
What Got Done - The simple, lightweight alternative to team status meetings.
Kin Calendar - The simple and connected calendar
Catch - Catch is the easiest way to use ShowRSS on OS X. It'll take care of everything.
Calendly for Chrome - Schedule meetings without leaving your inbox
Talllly - A team to-do list that keeps score.