I have some crimp on ones.... nothing fancy…. I can slip the end over the accessory post and use the wing nut to hold the wires for my amps and pumps in place.
I have also seen some cool stuff in the back of the crutchfield catalogue with the allen key type of end. Check your local car stereo shops like car toys or mag hi fi for options.
You can find some great connectors. Depending on how many amps you are running they also have some splitters with fuses that would cut down on how many power and ground lines you would need to run.