As /u/compumike mentioned the core spice algorithm is an LU decomposition and solve of a large matrix. Not sure what a good resource these days would be; it's b

As /u/compumike mentioned the core spice algorithm is an LU decomposition and solve of a large matrix. Not sure what a good resource these days would be; it's been many years since I worked on this. The JS experience wasn't great. We used emscripten and the tooling barely worked for the simulator core. The rest of the app wasn't bad, but we used polymer / webcomponents which was a big mistake IMO