Fairly new here, and am building my first cab (currently have it in the cardboard prototype stage)
Welcome to the hobby and congratulations on your cab prototype
Any other tools/utilities that I should be on the look out for or that you found to be very helpful?
Just off the top of my head:
autohotkey - very powerful keyboard mapping, script launching... many applications
JoytoKey - joystick inputs mapped to keyboard
PPJoy - joystick inputs mapped keyboard
Daemon Tools Lite - creates virtual drives for CD/DVD images
Nircmd - this command line tool is useful in dozens of situations
Closemul - for quitting emulators that don't quit by ESC
mplayer - super lightweight command-line media player with no GUI
VLC - awesome media player, more powerful than mplayer
mp3tag - sort out your media file tags
Display Changer 2 (DC2) - command-line resolution changing
Romlister - sort out your game lists & ROMS
Attract-Mode, Hyperspin, Launchbox etc. - Frontends
Ghostkey - keyboard tester
Winkeykill, logoless - prevents Windows key from working
Sumatra PDF - lightweight PDF reader; no need for Adobe bloatware
Notepad++ - Like Notepad but better, especially for large files like mame.xml
Filezilla - Transferring files over networks!
CPU-ID, GPU-ID - properly identifying your hardware
All of the above are free, though you may feel like donating for some. There are a bunch more that I might use only once or occasionally.
I've barely scratched the surface of what autohotkey can do, many things, so worth a mention. One thing I know is it can manage volume control for you via buttons or even a mouse wheel. Which might mean you don't need to use Eartrumpet or chocolatey.
Nircmd is another one that has countless uses. I mostly use it to help launching and/or prioritising other applications and killing processes, but really it can do lots more. Read the help files and lists of commands.
You can also avoid software/buttons/wheels completely with a volume control pot. Check it out, I recently wrote-up
how I made a simple decent volume control for about $10 in parts and (almost) no soldering.