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Objects
LFO Quaternion Objects	External		Free externals for using and converting Quaternions in Max/MSP/Jitter
lfo.qn2rot	External		Converts a quaternion rotation into jit.gl.* "rotation angle x y z" format.
lfo.qnadd	External		Add two quaternions together, with optional initial argument for quaternion to be added.
lfo.qnconj	External		Calculate inverse (conjugate) of quaternion.

Library
LFO Quaternion Objects		Free externals for using and converting Quaternions in Max/MSP/Jitter. Includes source code as XCode project, BSD license.