All GUIs should do that. They all show the engine's recommended line, with the scores. That's part of the engine's output, that the GUI reads.
So yes, WinBoard, Scid vs. PC, Arena, Shredder, Fritz, etc., will all do this, assuming I understand your question correctly.
You will want to set your PV (Principal Variation) to something more than "1." For example if you set it to 5, it will display the top 5 moves, and the numerical score for each.
Areno doesn't look good in pv.
Scid vs pc works well.
Thank you very much! I have Arena 3.0 and I just didn't know how to make it do that (didn't even know what it was called). Thanks!
Is there anything else I should know about GUIs that might be interesting?
Yea, probably. My favorite GUI is now Scid vs. PC. I made a tribute to it, located here.
Check out the helpful tips section. It's very possible Arena can do most of these tips/tricks as well. (The commands and the menus to do so will be different of course, but the idea should be the same.)
Is there a good (preferably free) gui that shows the (numerical) evaluation of of all the moves the computer is considering? I think I saw kingscrusher (from youtube!) using something like this where the gui showed the top 5 moves the engine was considering and their relative point value.
Hope that is clear！ Thanks for the help!