GPS Status & Toolbox - Display your GPS and sensor data: Shows the position, number and signal strength of GPS satellites.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Trail Sense - An Android app which uses your phone's sensors to assist with wilderness treks or survival situations.
Standard Notes - A safe place for your notes, thoughts, and life's work
iHunter Alberta - iHunter Alberta is an amazing mobile application offered by Inside Outside Studio Inc.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.