On windows, NVDA is also widely used and is free, but you will need to buy a good vocaliser/voice for it. Windows has a built-in Narrator, but the voice is not clearly audible at high speed, so people tend to move on.
On phones, iOS and Android both have built-in, capable screen readers, but they lack flexibility for internet usage.
On OSX, the built-in VoiceOver technology is apparently good, and widely used.
If you're wanting to test what the screen-reader experience might be like, you could do worse than trying the one built in to your operating system (Windows Narrator or iOS VoiceOver). Increase the voice speed for a better experience.