Meetingbird for Gmail - View your calendar and schedule meetings right from Gmail
Jodel - What is Jodel all about? Jodel is the community that shows you what's happening in your area in real-time.
Kin Calendar - The simple and connected calendar
Berkanan - Chat with people nearby. Even offline, on an ✈️.
Calendly for Chrome - Schedule meetings without leaving your inbox
Treadie - Create your own micro-social network for topics