For just a guide TitanTV is pretty good. It allows you to set up grids corresponding to your receiver Favorites and/or Guide (or as many grid variants you desire). It can be a little pain to configure (not unlike hiding channels for your Favorites and Guide).
Of course there are many other on line grids which a google search will find. But TitanTV is my favorite of all the on line grids. Of course 99.999% of the time I just use the receiver display.
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