The ActivePython Python distribution is a distribution focusing on an easy install and use. It provides builds for a number of platforms: Linux, Windows, Mac OS X, Solaris, HP-UX and AIX. On Windows, ActivePython also includes Win32All (a.k.a. pywin32).
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In addition, ActiveState provides a quality assured enterprise version, OEM licensing, CD/DVD distribution, and support which may be attractive to some customers. Another product of ActiveState is Komodo IDE which is a useful IDE for Python and other scripting languages.
ActiveState is one of the most well known and one of the longest running suppliers of Python distributions, tools, and support.