How to get it
The stable versions of ViTables (source and wheel packages) are available in its SourceForge page.
The latest version is also available as a conda package that can be installed with conda.
In addition, you can get the latest (and possibly buggiest ;-) sources from the git repository if you follow these instructions.
ViTables packages exist for several GNU/Linux distributions, although they aren't always up to date. Some of these distros are OpenSUSE, Mandriva, Arch Linux, Debian, Ubuntu, Gentoo, Trisquel and Fink. Just use the distro's package manager in order to find and install ViTables.
Last but not least, ViTables is included in a couple of scientific-oriented Python distributions, WinPython and Python(x,y). Also you can get the Windows binaries (and many other binaries for interesting software) from Christoph Gohlke's website.