St. Johns Wort is worth a look. Someone on GLP was using a computer simulation to measure the Gibbs free energy of docking various compounds to the 4 proteins associated with Sars-CoV-2. Out of all the compounds tested, the most effective were (in order):
Hypericin (St. Johns Wort)
Asiaticoside_A/B (Gotu Kola)
Glycyrrhizin (Licorice Root)
Protodioscin (Tribulus Terrestis)
They actually beat Hydroxychloroquin and Remdesivir by a fair amount for all 4 proteins
PDBid: 6LU7 (COVID-19 main protease):
PDBid: 6VSB (2019-nCoV spike glycoprotein):
PDBid: 6VW1 (2019-nCoV post-fusion core protein):
PDBid: 6LXT (2019-nCoV post-fusion spike protein):
I would post it all, but it's a massive amount of data.