pkgsrc is our primary package manager for SmartOS, our illumos distribution. We also provide binary packages for OS X and Linux:
pkgsrc should still work on Solaris 10, and there are a few people in the community continuing to provide patches for it, but obviously a lot of us have moved onto illumos so the support and documentation isn't going to be as good. That said, the aim of pkgsrc is to support every system possible, so we will always welcome contributions.