Get Inkscape for GNU/Linux
Latest stable version (0.91)
Inkscape is pre-packaged for most of the widely used free GNU/Linux distributions.
So your package manager / app store should be able to find Inkscape in one line.
Keep in mind that the version offered in your distro's repositories is not necessarily the latest version.
Inkscape for Specific Distributions
Ubuntu: Stable PPA or via package management (0.91 from Xenial on)
OpenSUSE: Package Search