Minimal Reading Mode - Optimize websites for reading: font, contrast, night mode
Wordpress Read Time - Shows you the reading time of your blog post as you write
Reading Time - Tells you how long an article takes to read
How Long to Read - Find out how long will it take you to read that book
Readlax Chrome Extension - Chrome Extension - speed reading tool, online reading
The Read Time - Calculate read time, speech time, and word count of any piece of text all at once!