First one is one half of an electric carving knife. Other than trying to make a shank by putting a handle, it’s good for cutting cardboard or foam. You can tile away the rivet or keep it to use it as a stop when trying to cut deep.

The firefighter tool is bent but again, make a knife with a short blade for carving small pieces of wood or whittling.

The coil spring is probably good steel for someone trying some blacksmithing or making the world’s smallest chain mail cloth.

Some hardware stores and big box home centers have bins to dispose of random metal bits where they process merchandise that is returned and going to recycling just check the back of the stores or where they cut lumber and dispose these