Payhawk - We combine company cards, reimbursable expenses, and accounts payable into a single product to help businesses throughout Europe, the US, and the UK save time, control spend, and stay agile.

GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.

Spendesk - Smart spending solution for agile teams

KMyMoney - KMyMoney is a personal finance manager for KDE.

Wallester - Walletser is a FREE expense management and card-issuing solution for businesses. ZERO fee for service and top-up for all cards. Issue 300 virtual cards instantly for free. EU BINs and whitelisting.

Money Manager Ex - Money Manager Ex is a free, open-source, cross-platform, easy-to-use personal finance software.