Here are some second/third line treatments for mood disorders. I'll assume you know the first line ones. I've listed a few trade names in parenthesis, but there are often other drugs in that class.

Depression
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NDRIs (Wellbutrin)
SNRIs (Effexor & Cymbalta)
ECT Treatment
Stimulants (Ritalin, Modafinil, & Adderall)
Anticonvulsants (Lamictal)
Lithium
Sleep Deprivation
Light Therapy

Bipolar
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Off label anticonvulsants (Topamax)
Antipsychotics