GPS Status & Toolbox - Display your GPS and sensor data: Shows the position, number and signal strength of GPS satellites.
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Trail Sense - An Android app which uses your phone's sensors to assist with wilderness treks or survival situations.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
iHunter Alberta - iHunter Alberta is an amazing mobile application offered by Inside Outside Studio Inc.
Nextcloud Contacts - The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.