ftp://ftp.mozilla.org/pub/mozilla.org/seamonkey/releases/1.0.2/contrib/
SeaMonkey is a continuation of the Mozilla Suite, which was discontinued by the Mozilla Foundation. It is based on the Mozilla 1.8.x code base, like Firefox and Thunderbird 1.5.
http://www.mozilla.org/projects/seamonkey/
Note that current builds require an updated version of ipluginw.dll for Java support; see my Warpzilla tips page for more information (http://www.os2bbs.com/os2news/Warpzilla.html). In semi-related news, you can see current plans for the Mozilla branches (http://wiki.mozilla.org/Global:1.9_Trunk_1.8_Branch_Plan).
Source: OS2 Warp News and Rumors