JAWS!

NonVisual Desktop Access (NVDA) is a free and open source screen reader for the Microsoft Windows operating system. Providing feedback via synthetic speech and Braille, it enables blind or vision impaired people to access computers running Windows for no more cost than a sighted person. Major features include support for 43 languages and the ability to run entirely from a USB drive with no installation.

Orca is a free, open source, flexible, and extensible screen reader that provides access to the graphical desktop via speech and refreshable braille.

This is Google's screen reader which is built-in to many phones. It's worth getting the latest version from the market to gain the latest improvements. Some special scripts are included to improve access for some popular third-party apps. Get the Accessibility Preferences app to adjust Talkback's few available settings.

Developed for blind computer users, SuperNova Screen Reader is a software screen reader that works by reading the screen interactively and communicating through a speech synthesiser or a refreshable Braille display.

Serotek’s System Access software brings you accessibility anywhere, and is available in configurations to meet every lifestyle and budget.

GW Micro is an adaptive technology vendor, providing high quality solutions for blind and visually impaired.