Hi Deepak,Actually both Seamonkey and NVU use the code from Mozilla Composer. I'd like to know which one received more updates so far, and if NVU changes to composer code base were merged into Seamonkey.
s, Fernando Lozano
KompoZer (http://sourceforge.net/projects/kompozer) is considered as an unofficial bug-fix release for Nvu. Seamonkey (in Extras) also provides a graphical webpage editing facility. After installation, see File:Edit Page.