Hi there

If you like e-books - great piece of Free software which also converts to all ebook formats so if you want MOBI / EPUB etc etc.

64 bit version for windows also available -- and it also works on LINUX (easily installable too) - running on CENTOS 7 shown here. Also works absolutely fine on Windows 10 too.

Click image for larger version. 

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Get it from here (Windows, Linux, etc).

calibre - E-book management