If you are looking for Free Budget Software, often times you are going to come to a website that has a lot of google advertisements and end up reading a blog that is telling you about free budget software.  The best site that I found was the Money Blog which includes a source of budgeting tools and links.  A lot of the links are for free ware.  A lot of the other sites that I have searched include a "Free Trial" for the budget software.

Don't forget that your own computer system most likely includes a spreadsheet program that you can use for your budgeting.

Below is a free budget spreadsheet from Microsoft's office solutions website  Personal Budget