If you have usable things in your garage or attic, you can offer these items to the local reuse group instead of dumping them in the garbage. If you're looking for something, instead of heading to the mall, you can check a reuse group first.
Specific items offered vary, but you'll generally find household goods like electronics, furniture, clothes, books, toys, and sports equipment. Anything that is legal and appropriate for all ages may be offered for free.