spin-off

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Offshoot.
• noun An incidental benefit or unexpected pay-off.
• noun By-product.
• noun A fictional work where the protagonist was introduced in a preceding work or at least shares the same equivalent setting, often in a different aspect.
• noun The formation of a subsidiary company that continues the operations of part of the parent company; the company so formed.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a product made during the manufacture of something else