August 19 is the petition deadline for New York independent candidates, and the nominees of unqualified parties, for state office. Here is a link to the petitions filed for the November ballot. It seems likely that there will be seven candidates on the November ballot for Governor: Democratic incumbent Andrew Cuomo; Republican Rob Astorino Green Party nominee Howie Hawkins; Libertarian Michael McDermott; the nominee of the Sapient Party, Steven Cohn; Jimmy McMillan of the Rent is 2 Damn High Party; and Michael Carey of the Life & Justice Party..
The major party primaries are in September, so there is no absolute certainty that Cuomo will be the Democratic nominee. His Democratic opponent Zephyr Teachout has a strong campaign.
Here is the Sapient Party’s web page. The national chair is New Yorker Bobby Kumar Kalotee. In 2010 he was associated with a group that petitioned for New York statewide office as the Tea Party, but it did not get on the ballot. In 2008 he held himself out as the national chair of the Reform Party, and endorsed John McCain for president.
Here is a newspaper story about the Life & Justice Party. The party wants to make abortion illegal and wants changes in how disabled persons are treated. This post has been re-written to include the McMillan and Carey candidacies, whose filings had not been posted on the New York State Board of Elections webpage when the original post was written.