Show HN: Sioyek – PDF viewer for reading research papers and textbooks

Some of the features:

* Quickly preview or jump to figures/references/equations/etc. (even if the PDF doesn't have links)

* Search paper names in google scholar by middle clicking on their name

* Searchable table of contents

* Searchable highlights/bookmarks

* Browser-like history navigation

* Mark locations for quick navigation (Vim style)

* Synctex support

Video demo of some features: https://www.youtube.com/watch?v=yTmCI0Xp5vI