What are the best XBMC addons you ask? I composed a list of the eleven most popular XBMC addons along with a brief description.
For a list of the Top 100 most popular third party addons you can visit http://superrepo.org/
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One of my favorite XBMC addons would have to be USTV NOW. It is a completely free and legal service that allows you to stream the major US networks live. It is intended for Americans travelling abroad and is not available inside the US. So, my lucky Canadian friends enjoy your 7 free channels. Some are in HD. You simply have to go to the USTV NOW site and sign up for a free account. You then need to go into your system settings on your android tv box and add your email and password into the USTV NOW Addon and you are good to go. You can also purchase a monthly membership for around $30 a month and stream over 30 channels.