General: this package is for general use. It has Graphviz.app and the main command line tools. It doesn't include gvedit.app (a QT-based graph editor), smyrna (an OpenGL viewer for large graphs), or the pangocairo plugin (you get the quartz plugin instead). If you need any of these, build from the source tarball or macports graphviz. If you can work on fixing the build and packaging problems with these tools, send mail to gviz-bugs on research.att.com. (Note: smyrna crashes Xquartz 2.6.1 on some systems; update to at least 2.6.2.)
For older versions of Graphviz for Mac OSX, look here.
If you encounter problems with old PPC or early Intel Macs, you'll probably have to build from source using
homebrew or macports.
Some notes: 1) graphviz-gui (Graphviz.app) is a separate package in macports, and seems to be optional in homebrew. 2) Beware, if you do not already have packages like cairopango, ghostscript, and the GNU/X11 libraries needed to support gtk2, then it can take a long time, maybe hours, to build the default package with all the drivers. We rely on cairopango to size and render internationalized text, so there really is no royal road, though you can still build graphviz with a less expansive set of drivers that rely on libgd, freetype and fontconfig. Here's some good news: according to this page, there's a tar file you can download and install to get the command line build tools, to skip all the XCode glop.
Note: 2.28 is the last binary package provided for the Leopard version of OSX. If you need a version later than that, you will need to build it from
source or use something like macports.
Note: For some reason, the Graphviz app no longer works in the 2.38
and 2.39 packages for Mountain Lion (and Maverick). If you just need the
command-line tools and libraries, these still work and are installed in
/usr/local as usual. If you want the app, you can get it from
homebrew or macports, or use the 2.36 version below.