tamoxifen (nolvadex)
anastrozole (arimidex/l-dex)
clomifen citrate (clomid)
hcg
exemestane (aromasin)
then you have a host of other herbs and natural products that can be used. You also have some new products coming out by the research companies which can also be used during pct. I haven't used them, so I'm not discussing it here.