We are currently looking to port JACK and the cream of Qt-based Linux audio software to Haiku:
but it seems to me that the best FOSS audio plugins all use JUCE now, which unfortunately doesn’t support Haiku or BeOS - yet!?
Yes, I realise Haiku is still in alpha but its in quite an advanced alpha (more like beta) stage now and so if work was started on a JUCE port to Haiku now then there’s a good chance the first stable Haiku release (R1) will be available by the time its done as I should imagine its a pretty big undertaking. There is a lot of info on Haiku development here:
Would anyone else be interested in seeing this happen, even if its an unofficial port?