Plus One Games have released a free version of their +1 Table Top Helper Android application.
From their announcement:
+1TTH is designed to display your army lists for table top games, for use as reference. It currently supports Game Workshop’s Warhammer 40k.
This app comes as a blank canvas, all data has to be inputted by the user, but spend a couple of minutes putting in your army and rules and it can be a time saver whilst playing.
The free version has no feature or time restrictions, but it only allows 1 army to be saved at a time. The Paid version currently allows up to 5 armies (could be increased) to be saved.