beancount

A double-entry accounting system that uses text files as input.

Beancount defines a simple data format or "language" that lets you define financial transaction records in a text file, load them in memory and generate and export a variety of reports, such as balance sheets or income statements. It also provides a client with an SQL-like query language to filter and aggregate financial data, and a web interface which renders those reports to HTML. Finally, it provides the scaffolding required to automate the conversion of external data into one's input file in Beancount syntax.