It doesn't have to be a company either. I'm not a programmer, but I'm interested in participating.
A plan of actions should probably include:
1. fork the current github repository, so that motivated people can focus on bring it back to life.
2. deciding some milestones such as
2.1 crucial bug fixes.
2.1 bring all related backend dependencies especially nifi, spark etc to the latest versions.
2.2 bring frontend dependencies such as angular to latest versions.
2.3 design and implement example cases and implement them as bundled test scenarios with docker.
2.4 review and update all documentations etc.
It seems a lot of work, lol.