"WebHTTrack, a complete Linux/Unix GUI for HTTrack"
Steps to Reproduce:
Re-assigning to dholm, as he's now maintaining HTTrack.
From what I see, webhttrack was added to the main package in version 3.30. Add net-www/httrack ~x86 to /etc/portage/package.keywords, and when you upgrade httrack webhttrack should also be installed.
Jeff is right, WebHTTrack is included with recent versions of httrack.