Cledit is a useful ChangeLog editor.
It is written in shell script, and it is a modified version of Dan Armak's change, a tool for updating Gentoo Changelogs. I just modified it to make a generic ChangeLog editor.
Cledit 0.2 can create HTML colorized ChangeLogs and check ChangeLog's spelling using aspell.

cledit-0.2.tar.gz - ChangeLog
cledit v 0.1