Here are some more environments for MaxMSP modules more or less related to the philospphy of Jamoma. I have not had the time to check out of all them yet to see how they compare to Jamoma:
Cooper is a flexible environment which can be controlled from meta-parameter-levels without loosing direct control of single parameters or giving responsibility to the computer. The idea was to create a flexible environment which can be controlled from meta-parameter-levels without loosing direct control of single parameters or giving responsibility to the computer. The audio processing is encapsulated into modules, which get connetcted through a matrix.
MaWe has been designed as a compositional and performance tool for audio and video purposes.
mirage is a software written in a Max environment, initially conceived for sounds and recently equiped with powerful tools to treat images (Jitter, SoftVNS, etc.).
lloopp is a software written in max/msp, designed for live-improvising on a macintosh.