Kavita is described as 'Lightning fast with a slick design, Kavita is a rocket-fueled self-hosted digital library which supports a vast array of file formats. Install to start reading and share your server with your friends. book reader, self hosted, manga, comics, free, manhwa, e readers, electronic' and is a Ebook Reader in the news & books category. There are more than 100 alternatives to Kavita for a variety of platforms, including Android, Windows, iPhone, Mac and iPad apps. The best Kavita alternative is calibre, which is both free and Open Source. Other great apps like Kavita are Okular, Foxit PDF Reader, KOReader and MuPDF.
Neko is a MangaDex specific fork of Tachiyomi and TachiyomiJ2K. This contains features specific to Mangadex that those versions cannot offer. It also features almost every feature that J2K has except for other sources,local sources, and editing manga.
GooReader is a desktop application that allows you to search, download and read books and magazines available on Google Play Books , add bookmarks, annotate pages, create local library and manage your Google Library.
Komga is a free and open source comics/mangas server with a web-based interface for browsing, searching and reading books and series as well as for administering accounts and access.
Comic Book Reader is the viewer you need to enjoy all your electronic publication. It is available both as Desktop and Windows 8 Metro UI for PC and tablets.
Panels is a CBR/CBZ/PDF comic reader for your iPhone and iPad devices. Enjoy reading your comics in a clean and delightful interface.
One of the best ways to learn a new language is by reading books in it. But this can get very tedious, as you frequently need to switch between the dictionary and the book you're reading. Duofolio's purpose is to make that experience a little bit easier.
PDF Viewer Pro is a fast and beautiful app, allowing you to view, search, and annotate PDF documents with ease on your iPhone and iPad.
eBooks.com's Ebook Reader lets you read your favorite books on the go. Choose from a massive collection of popular books that you can download in a jiffy.
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Still in development but very promising !