FreshBooks - The ideal accounting software for small business owners.
Grisbi - Accounting for everyone !
Zoho Books - Smart Accounting for Growing Business
Ledger-cli.org - Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line.
Paymo - Manage projects, track time, create invoices, and get paid online.
Gnuaccounting - Gnuaccounting is a Free Java cross-platform accounting and bookkeeping application. Features