Who doesn't like a good read? Instead of frittering away your time on social media or a [messaging app][2], you can enjoy a book, magazine, or another documenton your Android-powered phone or tablet.
Let's start off with my favorite open source Android eBook reader: [Book Reader][3]. It's based on the older, open source version of the now-proprietary FBReader app. Like earlier versions of its progenitor, Book Reader is simple and minimal, but it does a great job.
[Cool Reader][9] is a zippy and easy-to-use eBook app. While I think the app's icons are reminiscent of those found in Windows Vista, Cool Reader does have several useful features.
* It's highly configurable. You can change fonts, line and paragraph spacing, hyphenation, font sizes, margins, and background colors.它高度自定义，你可以改变字体、行宽、段间距、连字符、字体大小、页边距和背景色。
* You can override the stylesheet in a book. I found this useful with two or three books that set all text in small capital letters.你可以覆盖书中的样式表。我发现它在两三本设置所有文本为小写字母的书中很有用。
* It automatically scans your device for new books when you start it up. You can also access books on [Project Gutenberg][10] and the [Internet Archive][11].
* Cool Reader doesn't have the cleanest or most modern interface.Cool Reader没有极简或者前卫的接口。
* While it's usable out of the box, you really need to do a bit of configuration to make Cool Reader comfortable to use.虽然它开箱即用，但你真的需要调整一些配置来更舒适地使用Cool Reader。
* The app's default dictionary is proprietary, although you can swap it out for [an open one][12].app的默认词典是有专利的，尽管你可以用开源的词典来替换掉它。
You can use Cool Reader to browse EPUB, FictionBook, plain text, RTF, HTML, [Compiled HTML Help][13] (.chm), and TCR (the eBook format for the Psion series of handheld computers) files.
![Cool Reader Android app][14]
Cool Reader's source code is licensed under the GNU General Public License version 2, and you can find it on [Sourceforge][15].
### KOReader
[KOReader][16] was originally created for [E Ink][17] eBook readers but found its way to Android. While testing it, I found KOReader to be both useful and frustrating in equal measures. It's definitely not a bad app, but it's not my first choice.
* It allows you to look up words using a [dictionary][18] (if you have one installed) or Wikipedia (if you're connected to the internet).它允许你使用词典（如果你已安装）或者Wikipedia（如果你有网）来查单词。
* You need to change the settings for each book you read. KOReader doesn't remember settings when you open a new book.每读一本书你都需要改变设置。在你新阅读一本书书时，KOReader不会保存相关配置
* The interface is reminiscent of a dedicated eBook reader. The app doesn't have that Android look and feel.它的界面让人觉得是一个专用电子书阅读器。app没有安卓的外形和感觉。
You can view PDF, DjVu, CBT, and [CBZ][5] eBooks. It also supports EPUB, FictionBook, .mobi, Word documents, text files, and [Compiled HTML Help][13] (.chm) files.
KOReader's source code is licensed under the GNU Affero General Public License version 3.0, and you can find it on [GitHub][20].
### Booky McBookface
Yes, that really is the name of [this eBook reader][21]. It's the most basic of the eBook readersin this article but don't let that (or the goofy name) put you off. Booky McBookface is easy to use and does the one thing it does quite well.
**Pros of Booky McBookface:**
* There are no frills. It's just you and your eBook.
* The interface is simple and clean.
* Long-tapping the app's icon in the Android Launcher pops up a menu from which you can open the last book you were reading, get a list of unread books, or find and open a book on your device.
**Cons of Booky McBookface:**
* The app has few configuration options—you can change the size of the font and the brightness, and that's about it.
* You need to use the buttons at the bottom of the screen to navigate through an eBook. Tapping the edges of the screen doesn't work.
* You can't add bookmarks to an eBook.
**Supported eBook formats:**
You can read eBooks in EPUB, HTML, or plain text formats with Booky McBookface.
![Booky McBookface Android app][22]
Booky McBookface's source code is available under the GNU General Public License version 3.0, and you can find it [on GitHub][23].
Do you have a favorite open source eBook reader for Android? Share it with the community by leaving a comment.
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/computer_browser_program_books_read.jpg?itok=iNMWe8Bu (Computer browser with books on the screen)
