How to find this program?

Question

Software and Internet Services

I accidentally heard about a program in which you can open books of different formats, for example .pdf, and you can also set up such a function so that when you hover over words (for example, in English), a translation of this word (for example, in Russian) is displayed
If there is such a program ... can you tell me what it's called? You are welcome.

Answer 1

qtransl.ru