[LAU] notation software

Hi, It's been a while since I researched notation software. What are the major players in the linux world? What is being actively maintained? What is new and cutting edge? Note: I use lilypond for printed scores but I'm looking for some distinct functionality for in-score composing and orchestrating: - individual jack midi routing at least at the staff level, better if staff supported multiple voices and each could be routed separately. - step input with both external keyboard as well as mouse - customization for in-score articulations, e.g., staccato -> channel change or slur/legato -> insert note ( for key switch software instruments) - lilypond and/or midi export functionality. I'd appreciate any advice. thanks, David