Most of mine are at work, and they are predominantly bent wrenches of one variety or another. I have a 9/16" EGR wrench, but the stock bend of it allows ****-all for torque. It's been bent more in a vise to get better leverage. This is good for removal, and installation. Those bolts go through heat cycles, and can be a bit tough to get cracked loose. I ran into ONE once that used 10mm bolt heads (different year), and for that, I bent a 10mm wrench, and used another wrench through the open end as a t-handle. My box was issued to me, and I made sure to keep every odd, fabricated piece. It came from a guy who retired... I figured a lot of those were made for a reason.
Made my own holder for crank hubs. A pipe, squishing, and a couple bolts later... did its job. Also used an old crank pulley hub+ old bearing race to make a seal installer for the crank seal. Used some air line, and standard fittings to make an air supply line for measuring and cutting brake cans. Made my own test wires/test leads at work. Lots of modifications from need. I'm not sure how the guys who issue tools still think basic industrial standards (if that) actually cut it 100% of the time. Oh yeah... they guys who do that, don't wrench. Lol.