From the AFB website:
"We offer you a free downloadable, fully accessible, web site rating toolbar application (which we affectionately named "Helen") that will enable you to have your voice heard as you experience problems and/or success in using any website. And, most importantly, Helen™ will enable the collective voice of the user community to be heard by website providers, extending Helen Keller's lifetime efforts and legacy as an advocate for those whose voices might not otherwise be heard".
The Helen Toolbar Application is Freeware provided by the American Foundation for the Blind. Click this link to visit the AFB website to download.