GnuCash runs under Windows, Mac OS X, and many flavors of Linux/Unix. Installation is generally quite easy; instructions specific to different supported operating systems are given below.
You can check distrowatch.com for distributions which include GnuCash.
Notes on specific distributions:
Mac OS X
- GnuCash runs on Mac OS X. Download the binary package from sourceforge.net.
- For compiling GnuCash on Mac OS X, see MacOSXInstallation and specific MacOSX/Quartz tips