The most recent version of Census 2 is always this one. If you've downloaded Census 2 from anywhere else, you probably need to update it from here. If you're looking for Census 1.x, it's still available from here.
The current release is 2.03 (4 December 2013).
|Mac OS X||census-2.03.dmg|
Building Census yourself
The source code is available here: census-2.03-source.zip. In order to build it for your system, or modify it to your needs, you're going to need some things...
... as well as some additional open source components: