Mercury's functions are great and numerous, the program sadly became a bit resource hungry (better to spend 8 than 4GB of RAM, about 700+MB on the hard disk for a permanent installation. In this perspective, it is nice Jmol equally can be used to display/highlight symmetry relationships in crystals (link to an animated .gif) for less than 70MB when using Jmol's console. Source: over 1 year ago

I use Skanect with my high school students. Like others said, it's pretty blobby, but works for miniatures that I make the kids. I'm not sure if it still exists after the buyout, but the "try" version used to be free with the caveat of only being a 5000 poly export (I usually export at around a million for my models). Source: about 2 years ago

Skanect works the best, but you also need to install the OpenNI2 drivers. Skanect is also a paid program, in theory, although you can eternally use the trial version just fine if you know how to be creative with the options the trial version freely offers., last I knew. I liked it enough to purchase the most recent version after skimming by with the workarounds for a while. Source: almost 3 years ago

I got the pro version of Skanect 1.11 from: Https://skanect.occipital.com/. Source: about 3 years ago