blocks.draftsperson.net Is one of our favourite websites to download free CAD files. Here is a handy index of the categories of DWG files you can find on this website:
Sub categories: Architectural Symbols, Building Services Symbols, Civil Symbols, Electrical Symbols, General Symbols, Hydraulic and Plumbing Symbols, Mechanical and HVAC Symbols, Structural Symbols, Titleblocks.
Sub categories: Bathroom, Cleaners Room, Domestic, Electrical and Electronics, Fictional, Fire, Kitchen, Laundry, Medical, Meeting Rooms, Military, Music, Office, Reflected ceiling plan (RCP), Shipping, Wheelchairs, Wind.
Sub categories: Lifting.
Sub categories: 4WD / SUV / Utes / Vans, Ambulance, Bicycle, Boat, Bus, Car, Cranes, Domestic Aircraft, Earth Moving, Fire Trucks, Forklifts, Formula One, Helicopter, Military Aircraft, Motorcycle, Sports Car, Farm Tractors, Trains, Trucks, World War 2 Aircraft.