Check out the following apps:

Clampik

Claim your items in the bill... Split it fairly!

Kountem (Web)

Track item quantities during group orders (e.g., when ordering food with friends) through a clean interface.

Kountem (Android)

Track item quantities during group orders (e.g., when ordering food with friends) through a clean interface.

Feler (Android)

A File Cleaner Android App. Delete files that are older than x days from a folder. Include file pattern if required.