GeoBeagle is a free, open source application for the Android platform to aid users in finding geocaches and letterboxes. It enables the user to do paperless geocaching.
Geocaches and letterboxes are objects that have been hidden in the real world; the game of geocaching/letterboxing is finding these objects around you
Why do you need Geofence Tracker application?
1. With Geofence Tracker, you can create a specific "safe zone" or "unauthorized zone" on a map and get an E-mail Alert if the phone leaves the area
Geopaparazzi is a tool developed to do fast qualitative technical and scientific surveys. Its strength is its direct connection to the BeeGIS GIS, that can be used to further process the collected data.
Even if the main aim is in the field of surveying, it contains tools that can be of great use also to tourists that want to keep a geo-diary
GeoPix - Headed to work or class? Want your school's mascot or company logo to show up as your wallpaper, "abracadabra" style, just as you arrive? Simply choose an image from Myxer’s massive catalog of wallpapers, or grab one from your phone, set the address- and watch it "auto-magically" appear as you reach your destination
Glympse - Safely share your location in real-time via email, SMS, Facebook, or Twitter.
"Glympse: The Coolest Thing Your Smartphone Can Do"
-FastCompany
Glympse is the easy way to safely share your location in realtime. No sign-up needed. No social network to manage. Just send a Glympse to anyone via email, SMS, Facebook, or Twitter
GOmniTracker wonder where was your teenager spending time last night? or when did they leave school, home, or tennis-practice? Or maybe its granny you are concerned about whether she got back home from the park yet? gOmniTracker can answer these questions, and more, right from your Mobile Device
GoPenS is an OpenSource GPS application for Android phones, based on OpenStreetMap (OSM). OpenStreetMap is a collaborative map of the world. Therefore, one of the main functions of the application is to be able to record a trace and send it as a GPX to the OSM servers, and so edit the OSM Map