Updated !
For <Apple>
1. Coral Magazine - I think its updated every 2 months. Free magazines that talk about coral and marine fishes. Free
2. PocketReef - Basic database for fishes and corals. Free
3. Aquaplanner Pro - Very good App for tracking everything including alerts to remind you to change bulb, dosing etc. $2.99 (I paid and tried. )
For <Android>
I'm still looking for an Android App that can chart the various numbers, values, readings in the tank. Any ideas?