Brava! It is a freeware text reading application that's powerful, well-designed and comprehensive.
Here is a screenshot to illustrate the features and user interface of this application:
Open, view, and print TIFF, PDF and secure CSF files fast, while also enjoying powerful document navigation capabilities. Screenshot of Brava! Reader - 540px · 374px
Adobe Acrobat Reader DC
Doro PDF Writer
PDF Shaper
Calibre
Sigil