The Djvu format - one of the most popular. It can be compared to Pdf as books are stored in such format too, but, unfortunately, opening of similar files requires special software which there is not a lot of.
Files in the Djvu format - books which can be stored also in the PDF format. Opening of the second will require the program which is practically on each computer (Adobe Reader), and here Djvu will require other software, it can be found floating around the Internet.
There are two most popular programs for reading files in the Djvu format, it: WinDjView and DjVuReader. They practically differ in nothing from each other. The thing is that they narrowly targeted, that is are made especially for that it was possible to browse files in the Djvu format. In this regard it turns out that any additional or expanded functionality just is not required to them as they completely carry out the task.
DjVuReader
DjVuReader is distributed absolutely for free, so that it can easily be found in network. It possesses all necessary and is quite easy-to-work also to setup. For start of the file it is necessary to open DjVuReader in the menu located to select on top "File" and to select that book which should be opened. This software possesses one very interesting function - the choice of a display mode of the document.
With its help it is possible or to imitate reading the present book, or to switch to the one-page mode (something similar is used also in Microsoft Office Word). The user can install bookmarks on some certain place not to lose it. It should be noted that, unlike the competitor, DjVuReader is not required installation and the user can start reading the books having the DjVu format at once.
WinDjView
As for the WinDjView program, it is distributed absolutely for free too. The interface and functionality of this software practically does not differ from the previous option. Here too it is possible to install bookmarks, to browse different documents in the DjVu format, with a possibility of viewing pictures.
Besides, it is possible to enable automatic browsing of pages. For this purpose a certain interval through which the page will be leafed through without participation of the user is specified in settings of the program. On the basis of the same program one more was made - MacDjView which can work under the Mac OS X operating system. It possesses the same functions and settings that WinDjView, so it will suit all owners of such OS.