This is what I use to check for web page accessibility:  http://wave.webaim.org/about

This will read most aloud any website. Easy to use, but you need to know it exists. It is very low tech and not always accurate:  http://webanywhere.cs.washington.edu/wa.php

Window Eyes Screen Reader:  http://www.gwmicro.com/Window-Eyes/Latest_Features/

Can purchase a renewable monthly contract, and only get one month:  http://www.gwmicro.com/Window-Eyes/Payment_Plan/

Most Popular Screen Reader- JAWS -----does not appear to be any free licensing - there is a demo version:  http://www.freedomscientific.com/products/fs/jaws-product-page.asp

Zoom Text - 60 free trial -----------this amplifies and change color contrast:  http://www.aisquared.com/zoomtext/more/download_zoomtext_trial/

Accessible Keyboard Spring Cleaning Sale:  http://www.aisquared.com/news/more/spring_cleaning_sale/