Linked from
The 24 pages that link to Hydrogen fluoride, each with the reason it gives.
SuperacidRelated: It is the Brønsted-acid component in fluoroantimonic acid.
Sodium fluorideRelated: It can react with sodium-containing bases to produce sodium fluoride.
Fluoroantimonic acidRelated: It supplies the acidic component and solvent in the mixture.
Argon fluorohydrideRelated: HF supplies the hydrogen and fluorine atoms incorporated into HArF.