KMyMoney is a mature, open-source personal finance manager for the KDE desktop environment. It provides double-entry accounting with support for multiple accounts, currencies, investments, loans, budgets, and scheduled transactions. The application features a plugin architecture for import/export (QIF, CSV, OFX, GnuCash, iCalendar), online banking (AqBanking, OFX Direct Connect, Woob), and storage backends (XML, SQLite with encryption). The core domain model includes MyMoneyTransaction, MyMoneySplit, MyMoneyAccount, and related entities, all built on Qt's model/view framework. The codebase is large (over 3600 files) and has been under active development for over two decades, resulting in a rich feature set but also some legacy patterns and conditional compilation for Qt5/Qt6 compatibility. The architecture is a monolithic desktop application with a well-defined plugin system, extensive unit tests for core data objects, and a sophisticated reporting engine with pivot tables and charts.