I've used Extempore and GRACE, the cross-platform GUI for Common Music. I am a Lisper so these tick that box. I always wanted to use Opusmodus, and I think I will now. It has great tutorials and documentation and seems to have matured nicely. It has high-concept functions for composing compared with some of the others that require for you to build those functions. I'm not sure how it will compare with Extempore's live coding abilities.