AqBanking is a generic online banking interface. It allows multiple
back-ends (currently HBCI) and multiple front-ends (such as KDE, GNOME,
or console) to be used.

Gwenhywfar is a base library used to provide OS abstraction functions
for Linux, FreeBSD, OpenBSD, NetBSD, and Windows. It also includes some
often needed functions (for example, handling and parsing of
configuration files, reading and writingof XML files, and interprocess
communication).

KMyMoney is a personal finance manager.

KMyMoney is the Personal Finance Manager for KDE4. It operates
similar to Quicken, supports various account types, categorization
of expenses, multiple currencies, online banking support via QIF,
OFX and HBCI, budgeting and a rich set of reports.