We created the the Verilog-AMS standard ~ 25 years ago and I thought that would help get rid of the disparate SPICE dialects, I also built a Verilog-AMS simulator with HSPICE back then (since lost – literally, my Solaris PC got recycled by Avant!). For some reason Synopsys decided HSIM would be the only AMS simulator (despite it being the same level of effort to make them all do it).