You can buy Family Tree Maker for less than a tenner. The 'Who Do You Think You Are' version is the Starter Edition and doesn't have some of the functions of the full edition but it is fine for most people. You can download Family TRee Maker 2005 for free from here:
http://www.ancestry.com/learn/library/article. aspx?article=9788
I have this edition and the only thing I can't do is upload a GEDCOM file to another website but if you don't want to do that, it will be fine.
You can also download free programmes that are also easy to use, Legacy from www.legacyfamilytree.com or PAF from www.familysearch.org
If you want to keep your tree on a website, you can try www.tribalpages.com which is free or www.genesreconnected.co.uk but their tree builder isn't the easiest in the world to get along with!