Apparently some products still use it. TuneTracker is a system for running radio stations that uses Haiku http://www.tunetrackersystems.com/about_haiku.html

Honestly I still miss Gobe Productive. Fantastic productivity suite. Not very full-featured, but everything just came together in a smooth way I haven't seen replicated since.

From the era? Probably not. I like GoBe Productive and actually used PoorMan for some internal stuff, but neither would be sufficient for most uses today.

However, TuneTracker and its associated suite of tools for radio station automation ran on BeOS and then on Haiku. It's been a few years since the website was updated, so I do not know if it's still active, but it was worth running in a very specific setting.