Basically, a product is offered Free to Play (Freemium) and the user can decide if he wants to pay the money (Premium) for additional features, services, virtual or physical goods that expand the functionality of the game. This license is commonly used for video games and it allows users to download and play the game for free. There are many different open source licenses but they all must comply with the Open Source Definition - in brief: the software can be freely used, modified and shared. Programs released under this license can be used at no cost for both personal and commercial purposes.

Open Source software is software with source code that anyone can inspect, modify or enhance. Freeware products can be used free of charge for both personal and professional (commercial use).

There are functions for printing the document, searching for and quickly navigating to the desired page.įor programmers and amateurs of digging 'inside' there is a possibility to get the source code of the program.Freeware programs can be downloaded used free of charge and without any time limitations. Adjustment of the document to the width of the window with the possibility of scrolling, adjustment of the page according to the size of the window and turning to full screen.

There are scaling tools from 8.33% to 6400%. Tab support: you can open several documents and move between them with one click. Now you don't need to install two different PDF viewers and DjVu.Īll the main functions typical for such programs are available in the program. Particularly noteworthy is the support for DjVu format. It differs from its analogues by its high speed and support of several formats: PDF, ePub, MOBI, XPS, DjVu, CHM, CBZ and CBR. The size of the program is about 5 Megabytes. Moreover, Sumatra PDF can be installed without any installation at all, it is also available as a Portable version and can work from removable media, for example, from a flash drive. It is perfect when you need to view the contents of a PDF document, but you don't have the option or need to install a more serious program. Sumatra PDF is a small and simple program for viewing PDF files.

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