Hopefully, some day, I will sit down and write a 'main features' section again as the one in Moddb is horribly outdated (and that will probably be based off the wiki in the git explaining the new mechanics). There are tons of stuff, and tons of bugfixes and flavour, and honestly I don't think I could recall it all even if I wanted to. As it shred is NNM/PDM base, overtime, it grew to be much more. The Historical Project Mod (HPM) is a mod started in 2014 out of the desire to expand on several good mechanics from NNM and PDM, while making the changes I wanted to see to these mods.