On August 25, the Independent Party released the names of its nominees for U.S. Senator and U.S. House. Also the Blue Enigma Party released the name of its nominee for U.S. Senate. See this story, which also covers the Constitution Party’s failure to regain its spot on the ballot this year.
The Green Party is ballot-qualified in Delaware but has no nominees this year.
The Libertarian Party had already turned in the names of its nominees.