Simple Workflow is a workflow engine. It is simple to use (you need to call only two methods and implement one interface), written in Java 7, uses a simple domain language to describe workflows, can be used with any storage backend (SQL, NoSQL, file, etc.), can be used with any frontend, and has a high level of backend/frontend abstraction.
Currency Quoter is a tool that converts between currencies and forecasts the future range of that conversion. It is meant primarily for those who sell services in different currencies. It allows you to work out the current value and likely future value of a given amount in a different currency. The program also displays graphs of the corresponding exchange rate over time.