Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
Price Tracker by Relbis Labs - Price Tracker is a command-line tool for monitoring the prices of productsFeaturesTracking prices and availability of products.Tracking Amazon Kindle books.Displaying products information in a terminal.Exporting data into Excel and YAML files.
Dinngo - Splitting payments the fun and easy way
Pricy - Amazon price watch
/Tab - The simple way to split a bill among friends.