Google Opinion Rewards - Answer quick surveys and earn Google Play credits with Google Opinion Rewards.
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
CashPirate - Download CashPirate app for Android. ayeT-Studios' personalized beta-testing program that pays mobile phone users to download and install new apps. .
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.
Receipt Hog - A fun and rewarding way to turn everyday shopping receipts into cash.
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.