GnuCash allows you to track bank accounts, stocks, income, and expenses. As quick and intuitive to use as a checkbook register, it is based on professional accounting principles to ensure balanced books and accurate reports. It is backed by an active development community and is blossoming into a full-fledged accounting system.
GnuLedger is a Web-based accounting system. It has all of the functionality that an average home user needs to manage their finances. Its backend is a MySQL database, and it currently uses a web browser front-end. It has been tested using Internet Explorer, Mozilla, Opera, and QNX's Voyager.
Invoice Me is an online invoicing system, with automatic billing status indicator. With the correct IDs, customers may search their own invoices, and view the payment status (with an option to hide paid invoices). It features search, add, edit, and delete admin interface. When creating a new invoice, the administrator can opt to email a copy of the invoice directly to the customer. Viewers can print the invoices easily via a Print Mode.