Dave Yeo has released (3/19/2014) unofficial builds of SeaMonkey 2.14.11 and Thunderbird 17.0.11, based on the Bitwise fork of the Gecko 17 "Extended Support Release" branch, and updated to the last security updates for that branch.
Doug Bissett created (2014/03/21) WarpIn installers for SeaMonkey 2.14, Thunderbird 17.0.11, Firefox 17.0.5 beta2, and the required fontconfig runtime.
Source: OS/2 Warp News and Rumors