Some potential competition to Norront Fusion Energy AS: Starscientific, Australia
They mention muon catalyzed fusion in this video. The demo in this video certainly does not operate on μCF. Number of views is very low.
Claiming they found a catalyst about 3 years ago. Could be inspired by Holmlid I guess.
Their youtube channel: https://www.youtube.com/user/starscientific/videos
But status is not very clear. I can't find much more information on them.