Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.

Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.

Mapple.me - Mapple.me bridges the gap between available time and availability of friends to increase social...

Upcoming.org - A simple way to share and discover interesting events

OwnTracks - Cross-platform location sharing

Colloq.io - Discover a new way to the conferences you like.