Several different manufacturers make a generic Adderall (not Adderall XR). Some of these companies include:
Barr Pharmaceuticals
Eon Labs
Ranbaxy Pharmaceuticals.
Because the actual name for generic Adderall is very long ("dextroamphetamine saccharate, amphetamine aspartate, dextroamphetamine sulfate, and amphetamine sulfate"), the generic Adderall name will usually be shortened to fit on your prescription label. Generic Adderall is available in the following strengths: