Yes Invoice - Online invoice management for entrepreneurs and freelancers.
Grisbi - Accounting for everyone !
Simple Invoices - Never Wait For Clients To Pay You Again!
Finice - Finice is a sophisticated Money Tracker that aims to bring together all your finances in a single place.
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.