"Free software is a matter of liberty, not price. Think of "free" as in "free speech," not as in "free beer." Free software is a matter of the users' freedom to run, copy, distribute, study, change and improve the software. Read more."
There is no doubt this site has plenty of options but have to admit many get over my head quickly. May be for those with a little more time on their hands. Very interesting software options though.