RealFlow 2.5 and RealWave 2.18 for 3D Studio MAX 6 can be downloaded here:
http://snakeman.qu-zhou.com/3d/3dplugins/r/r.htm
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C.A.T (Character Animation Tools) can be downloaded here:
http://snakeman.qu-zhou.com/3d/3dplugins/c/c.htm
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All 3D Studio MAX plug-Ins you'll ever need can be downloaded here:
http://snakeman.qu-zhou.com/3d/3dplugins/plugins.htm