>> As far as I know vcs and ncverilog don't have nice guis. With those
>> tools you do everything on the command line.
>
> NC-Verilog has a GUI. You can invoke it with the +gui option to
> ncverilog, or the -gui option to ncsim.

I've also launched ncsim in post-process mode (ncsim +ppe ...)
But I must say, it's hard for me to remember all the necessary
command-line specifiers to select the right 'cds.lib', 'hdl.var', etc.
(I'm really dumb when it comes to design library management!)