Cinema 4d uses BVH extremely well, as does Animation Master, Lightwave, Max and I think there is now a plug-in from Credo for Truespace. Amapi, no. Raydream, no, but you can import a bvh'd poser4 file into RD5.5 I had similar questions when I began experimenting with the files, and found it very tough to get answers. It seems like the people who produce BVH want to keep things secret. This is probably because it costs thousands of dollars to buy or rent mocap systems and those who have them don't want to give anything away. The best resource I've found is Credo Interactive, makers of LifeForms, a great program which outputs motion files. They have tutorials for every program that uses bvh.