Most devices will have an in-built tool for people who want to have pages read to them.
Listen to this website with Narrator for Windows
Windows comes with a basic screen reader called Narrator, which reads text on the screen aloud while you're using the computer.
Listen to this website with VoiceOver for Max OS X
In newer versions of Mac OS X there is screen-reading technology already built into the system called VoiceOver.
Listen to this website with Spoken Feedback on Chrome OS
In Chrome OS there is a synthesized speech feedback option built into the accessibility features
Listen to this website on an iPhone or iPad
There are a wide range of accessible features on iOS devices such as iPhone and iPad.
Listen to this website on an Android device
Android devices also have a wide range of accessibility options to help the user.