64Fetch by Korbosoft is a neat little utility similar to something like Neofetch for Linux.  It's purpose is simple, display a nice formatted screen outpout of your Commodore 64 internals including Kernal version, CPU type, VIC type, SID type and CBM DOS version.

If you'd like to check out the source code (written in cc65) and know where to look for newer versions, look here.