ltspicerender takes subcircuits and symbols and creates macromodels from them. The idea is that you just add a "LM324" op-amp or a "BAT48" Schottky diode instead of fiddling with a generic diode, adding the subcircuit model and using a SPICE directive to marry the two. It also takes care of pin mapping, which can be a real pain (subcircuits routinely have differing pin layouts and in manual labor it can be tedious and error-prone to correctly set them up).
However, with recent LTSpice versions this doesn't work anymore. It worked in 2013 when I first created this (honestly!), but currently is dysfunctional. I need to fix it up to get it to work again.
GNU-GPL 3.