In the US, the Formulary has many listed and unlisted products for emulsion making. This includes:

Tetra Aza Indene (both powder and prepared solution)
Phenyl Mercapto Tetrazole (both powder and prepared solution)
Thymiol (crystals)
Glyoxal (40% solution which should be diluted 1:9 to make a 4% solution for use)
Baryta paper (DW glossy)

PE