Endorphin is either a chemical or hormone in your body that makes you happy, there are drugs that helps release them, chocolate is a good source of endorphin release, thats why some people go straight to the chocolate bars for comfort eating.
But no, the endorphin in topic here is a really expensive animation package for 3D, it's not a 3D modeller, but it provides realistic physic and psuedo-motion capture animations, it was used in the Lord of the Rings movies and is a fun program to use:
http://www.naturalmotion.com/
These dudes are the same people making Euphoria (which I felt a sense of endorphin when I watched the video for it, just then I didn't realise it was the same dudes)
There is a learning edition, which I assume this is the program people are talking about, because I highly doubt anyone has the full version legally on these forums, considering its price tag is £5495 ($9,495) which is cheaper than last time I checked
Also, has anyone tried the 3D World Magazine tutorials that came with the magazine with the endorphin demo disk, they're pretty cool, your just making realistic physics whilst bullying a crash dummy dude, like falling of a lot of ledges and trying to grab them as he falls down, it is one heck of a powerful program.
Did The Buddha have a Zen micro?