JComic

As of version 1.09.5, JComic is an open source project.
The source code can be found on github at https://github.com/koroshiya/JComic
*Note: if you encounter any issues, please mention them on GitHub. I NEVER check Google Play comments.

JComic is a comic book and manga reader aimed at users who like to read comics on their android devices.
It is simple to use, but with enough settings and features to keep power users happy, and includes features such as:
-favorite & recent lists
-the ability to resume reading from the last viewed page
-automatic caching
-swipe to next chapter
-material design GUI
And plenty more.

JComic currently supports the following formats.
Images: .jpg, .jpeg, .png, .gif, .webp (Android 4.0+)
Archives: .zip, .cbz, .rar, .cbr

*Comics used in screenshots belong to xkcd comics, and are licensed under a Creative Commons Non-Commercial license: https://creativecommons.org/licenses/by-nc/2.5/