Oh boy, sorry to hear that. There are some ways to get most simple tools like wrenches back. I hope you laid them out to dry as soon as you found them.
If there are joints (pliers) or mechanisms (ratchets) it's much harder. Anti-corrosion penetrants like Super-PBlaster (sic?) might help, given enough time.
On plated tools like end wrenches with just surface rust I'd burnish them on a wire wheel running either on a bench grinder or just an electric drill.
For rusted carbon steel, naval jelly is your friend (find at hardware store, Home Depot). Follow the directions to let it soak in and react with the oxides - this usually takes repetition. Good luck
Recently I took a bunch of rusty tools and put them on a piece of cardboard and sprayed them with WD-40. Couple days later turned them over and sprayed them again. Then, one by one, I sprayed and exercised whatever moves, like pliers. The tools may still look a bit rusty but they seem to work OK. WD-40 is pretty cheap and does the job.
From what I understand, the solution is alkaline and if an iron anode is used the waste water can be dumped on the lawn. It's good for the grass. The process actually converts rust back into iron. Electrolysis - Rust Removal
My mistake, I intend to use this process to clean the rust from off some railway line I have laying around. Then I can make a large C frame rivet squeezer out of it. I guess that would sorta count as my tools having rust on them:gig: