QuickMark - QuickMark makes everything possible.
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
ZXing - Barcode Scanner for Android
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
ConnectUpz - Helping service businesses to connect and grow your customer base by becoming part of of a larger ecosystem.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.