I think that Dianavan's comment does betray a failing of the US news media, so no wonder I found it hard (and am still finding it hard) to get a rounded picture of the options being presented (and obstructed) for teh US voting public.

Wikipedia list of candidates

Brian Moore, socialist party candidate   The website is not all that good. He is also in Wikipedia as "Brian Moore, politician"

Kat Swift, a green candidate
Again the website is poor, and again she is also in Wikipedia.

Do have a look at some of the others on the Wikipedia list. The fact that such loonies can stand for president gives me a little faith in the US system, but alas the way that dollars and media interests put a barrier in the way of propagation of points of view that are not from the political mainstream (NB, not the voters mainstream) of the main parties I think outweigh that little sign of health many times over.