Website: GnuCash

GnuCash is designed to be easy to use, yet powerful and flexible. It allows you to track your income and expenses, reconcile bank accounts, monitor stock portfolios and manage your small business finances. It is based on professional accounting principles to ensure balanced books and accurate reports.

What can GnuCash do for you?

  It can keep track of your personal finances in as much detail as you prefer.
  If you are just starting out, use GnuCash to keep track of your checkbook.
  You may then decide to track cash as well as credit card purchases to better determine where your money is being spent.
  When you start investing, you can use GnuCash to help monitor your portfolio.
  Buying a vehicle or a home? GnuCash will help you plan the investment and track loan payments.
  If your financial records span the globe, GnuCash provides all the multiple-currency support you need.

While GnuCash is well suited for personal finances, it is also powerful enough for business use. There are many business features, from integrated accounts receivable and payable systems, to tax table construction. You will find these and the many other business features surprisingly powerful and easy to use.

How to start?

There are two very important and detailed documents, written to help the use of GnuCash. They are both available online:

1. GnuCash Tutorial and Concepts Guide
2. Gnu Cash Help Manual. You can also download the full version of the Manual in a PDF format

GnuCash is backed by an active development community and is blossoming into a full-fledged accounting system. Developed under the GPL, you have no need to worry about obsolescence: GnuCash will always be there for you!