The Hawaii Elections Office website has a section that lists groups that have asked for the petition to create a new party. There are eight groups on the list: 1787, Aloha Aina, Free Will, Green, New Republican, Party for Socialism & Liberation, Royal Hawaiian Kingdom, and Solidarity.
There is no means to tell from the website which of these groups are actively petitioning. Parties already on the ballot are Democratic, Republican, Libertarian, and No Labels.
If you use the link, scroll down toward the bottom. The list also includes the website for each group.