KOReader Alternatives

KOReader is described as 'An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Kindle, Kobo, PocketBook, Linux and Android devices' and is a popular PDF Reader in the news & books category. There are more than 50 alternatives to KOReader for a variety of platforms, including Android, Windows, Android Tablet, Linux and Mac apps. The best KOReader alternative is SumatraPDF, which is both free and Open Source. Other great apps like KOReader are calibre, Okular, Librera Reader and Readest.