Firefly III

Firefly III is a free, open source personal finance manager. It helps you track income and expenses, use budgets, categories and tags, and see where your money goes. It is for people who want to keep their own financial records without handing them to an outside service.

The README lists double-entry bookkeeping, recurring transactions, rule-based transaction handling, piggy banks for savings goals, income and expense reports, two-factor authentication and support for any currency. It is fully self-hosted and does not contact external servers unless you tell it to. A REST API covers most of its features, and a Docker image is available.