GnuCash - Free Financial Management Software for Windows,Mac&Linux

GnuCash is personal and small-business financial-accounting software, freely licensed under the GNU GPL and available for GNU/Linux, BSD, Solaris, Mac OS X and Microsoft Windows. Personally I like it because of its rich functionality and easy of use. GnuCash is similar to Microsoft Money and it is used by accountant, small business/home user etc.
        Features:

1. Double-entry bookkeeping
2. Scheduled Transactions
3. Mortgage and Loan Repayment Druid
4. Small Business Accounting Features
5. Transaction-Import Matching Support
6. Multi-Currency Transaction Handling
7. Stock/Mutual Fund Portfolios
8. Online Stock and Mutual Fund Quotes

Download :

Microsoft Windows XP/Vista/7

Mac OS 

Linux