FreshBooks - The ideal accounting software for small business owners.
Ledger-cli.org - Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line.
Zoho Books - Smart Accounting for Growing Business
YouNeedABudget - Personal home budget software built with Four Simple Rules to help you quickly gain control of your money, get out of debt, and reach your financial goals!
Paymo - Manage projects, track time, create invoices, and get paid online.
Grisbi - Accounting for everyone !