BookView is a NDTP (Network Dictionary Transfer Protocol) client
written in Tcl/Tk.  It requires Tcl/Tk 8.3 or later or 8.0jp (`jp'
means `Japanized version').  BookView can talk to NDTPD and dserver.

You can get information about BookView from their website.

WWW: http://www.sra.co.jp/people/m-kasahr/bookview/