Adobe Acrobat Reader, SumatraPDF, PDF-XChange Editor, Okular, Foxit Reader, GoodReader, Xodo, Pdf+, Evince, iAnnotate, MuPDF, Preview, Comic Reader with Translator, Perfect Viewer, Firefox PDF Viewer (PDF.js), Free Opener, Chunky Comic Reader, webcomic.app, Flipping PDF Reader, Qoppa PDF Studio, MJ PDF Reader, PDF Professional, WinDjView, MangaMeeyaCE, PS to PDF, Madefire, Jomic, Comical, PDFlite, DocsPal, pdf-notes, ComicsViewer, Convert PDFs, Open Freely, GoodWriter, eXPert PDF Reader, Ultimate PDF Converter, POKATreader, PDF Reader Online, MakerX, PDF Assistant, Roboreader, AlternateReader, PDF Connect Suite are some alternatives to Atril.