jed   -- emacs-like editor for VMS, Unix, OS/2, and IBMPC

slang -- S-Lang language interpreter for C programs.  Includes programmable
         calculator as example application.  In addition, it includes all
	 sorts of routines for screen management, getkey, readline, keymaps,
	 etc... 
	 
most  -- more/less type file viewer for Unix and VMS.  Very powerful
         (multiple windows, and much much more)

slsc  -- spreadsheet program for Unix.  It is based on `sc' but is much
         friendlier with VMS style help, user definable colors, keybindings,
	 etc...

slrn  -- A S-Lang based NNTP news reader.  It is modeled after GNUS.
         Although, it is still under development, it is quite usable:
	 read/post/followup/reply/save/etc/etc...  About the only feature it
	 lacks is threading.