Moon+ Reader Pro is a free eBook reader for Android that has zero in app purchases.
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Pro Supports online ebook libraries
They have built in net library to search free eBooks.
Pro Easy to add your own Calibre library
Using the personal ebook manager 'Calibre', one can create a local server and make it as public as wanted; MoonReader can then accept it and present it as just another online ebook library, searches and all.
There are over 10 themes that users can switch up in the app in order to find a look that best suits their needs.
Pro Highlight, annotation, dictionary available in free version
Pro Premium version available
Moon+ offers a premium version of the app that offers more features such as PDF support for the price of $4.99.
Con Pdf unsupported for the free version
Con Free version lacks a lot of features.
The Moon+ reader is only really considerable as a good ereader app if one is willing to spend more than $5 for the paid version
Con Does not support Adobe DRM
This isn't so much of a con in open source or free readers, but really Moon+ is neither. There are better functionality/tradeoff options.
Con Options are a little bit confusing
The options are split up into pages that have more to do with history than logic. This will matter less after the desired options are set.