For MIG I have a Miller 130 that I use for sheet metal, and a Miller Suitcase MIG that I use if I need to do aerial or heavy duty mig welding. The Suitcases are made for heavy industrial plants, ship yards, etc.
For Oxy-acytelene I have an Victor set that I've owned for years. Includes a rosebud and various brazing and cutting tips, along with a large Smith's cutting torch.
For TIG I have a Miller Syncrowave 250DX, complete with pulse mode.
For stick I have an 35 year old Miller crackerbox welder that is AC/DC.
For a portable power source I have a Miller Trailblazer Pro 350A diesel engine welder with 100' of lead. It will drive the suitcase MIG, stick weld, and serve as a power source (12KW).
For plasma cutting I have a Miller Spectrum 2050.
I also have a Carbon Arc torch.
Support equipment includes a large welding trailer with 71 gallons of fuel, 80 gallon air compressor, 11 metal bins for storing grinders, welding supplies, welding tanks, clamps, Mag drill, etc. The trailer includes a large Jobox for storing porta-bands, sawzalls, etc.
The main accessory that I don't have that I wished that I had was a portable oven on the welding trailer for pre and post heating cast iron prior to TIG welding.