General Format Ebook and Ebook Reader

extension:
pdf
reader:
pc=adobe reader, foxit, sumatra

extension:
chm
reader:XCHM, Sumatra PDF Reader, FBReader, Mobipocket Reader, CHM Reader extension for FireFox,

extension:
epub
reader: Sumatra PDF Reader, Cool Reader, Calibre, EPUBReader FireFox extension

extension:
djvu
reader:WinDjView, STDU Viewer, DjVuLibre DjView

extension:
comic book image / GIF, JPEG, BMP or PNG.
cbr, cbz, cb7
Comic Book ZIP / RAR / 7zip / TAR / ACE
reader:  CDisplay Ex, GonVisor, CBR Reader, ComicRack, Calibre, Sumatra PDF Reader, Comical, HoneyView and Manga Reader.

extension:
mobi
reader:FBReader, Mobipocket Reader, Cool Reader


notes:
DjVu (pronounced "déjà vu") is a new image compression technology developed since 1996 at AT&T Labs. Most DJVU files are just scans. The text has been created using OCR software. If this software did not support your language, then obviously all the text is just gibberish. You normally can't see this, because DJVU files can show an image layer with the original image of the scan on top of the text layer.

multi reader

( for your reading hobby )

Cool Reader
FB2, TXT, RTF, DOC, TCR, HTML, EPUB, CHM, PDB, MOBI. Platforms: Win32, Linux, Android.

STDU Viewer
DJVU, FB2 and JBIG2, WWF, PDF, TIFF, TXT, CBZ, CBR, BMP, JPG, JPEG, GIF, PNG, PSD, EMF, WMF, XPS and TCR. With the compact size of just 4MB

Icecream Ebook Reader
supports both CBZ and CBR formats.

Evince
Free cross-platform file reader that supports DjVu, PDF, TIFF, DVI and PostScript documents and takes almost 76MB of your computer space.

Sumatra PDF Reader
DjVu, PDF, CBZ, CBR, ePub, Mobi, CHM and XPS. The size of the program is a bit less than 11MB.

FBReader
ePub, like Mobi, FB2, PDF, DjVu and some others.

referensi
https://blog.kowalczyk.info/
http://djvu.org/
http://www.uky.edu/
http://icecreamapps.com/