FiveThirtyEight.com, a popular web page devoted to predictions about future election results, recently mentioned a presidential candidate other than the Republican and Democratic nominees. This page suggests that Gary Johnson will get 6.6% of the popular vote, and a very slight chance of receiving an electoral vote.
They’ve been keeping track of Johnson on this page since early June, I do believe. Take note that if you page down to ‘Crazy and not-so-crazy scenarios’ they give Johnson a 2.7% chance of winning at least one electoral vote(as of 8/5).