Lunch Money - A personal budgeting tool with multi-currency support

Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.

Wallet - Wallet is the simplest and easiest way to keep track of and secure your most sensitive information.

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.

Actual Budget - Robust and simple budgeting that works

Pricy - Amazon price watch