Librera Reader

With its intuitive, yet powerful, interface, Librera makes ebook reading a veritable pleasure. It even features a unique auto-scrolling, hands-free Musician’s mode.
Two versions are available for downloading: Free version with ads, and PRO without (the free version obtainable via F-Droid is also ad-free).
MAIN FEATURES:
Easy document discovery by configurable criteria:
Auto-Scan
Browse
Recent (featuring a reading-progress indicator)
Support for bookmarks, annotations, and EPUB3 tables of contents
Support for clouds and online catalogs
Configurable Day and Night modes
Configurable link color (hence, footnotes and endnotes color)
Support for many popular online (including translators) and offline dictionaries
Vertical-scroll lock
Auto- and manual centering of documents
Custom CSS code input
Single-page view of two-page documents
Musician’s mode with configurable scroll speed
Customizable TTS reading and built-in media player
Multi-word text search
Online document conversion
Reading of archived (.zip) documents
Support for RTL languages (Thai, Hebrew, Arabic, etc.)
Import and export of settings, auto-backup of current session
Leading initials in FB2 documents
And a whole bunch of other features for you to check out.
You can easily create self-maintained libraries of all your documents by specifying which formats to include and which folders to scan. All document collections can be viewed as a list or grid. Documents are easily identified by size- and style-adjustable thumbnail covers and detailed descriptions. Your library can be sorted by path, name, size, date, etc., and there is a filter to help locate specific documents or document groups.
While reading, documents can be locked into a vertical-scroll-only mode and their navigation set to either page- or screen-flipping. Text can be reflowed and annotated. Volume keys’ functionality is configurable, and backgrounds and fonts customizable via the intuitive Settings window. Excerpts can be translated, shared, copied, and searched for on the Internet.