Someone I'd played with before was like. Hey, I'm planning on running a campaign in Delta Green, who's interested? And I looked into it and thought. Well, seems cool! And the rest is history.

You can use Ripper's script here to check your modules.

Alas, the Kickstarter and any late pledges they may have had is over. Hopefully, it'll either be put up for sale, or part of a future Kickstarter. Thanks for the answer!

The Friendly with a touch of the Collector but the collection is just consumables I haven't used because... what if I need them more later?

For names, I tend to use Behind the Name's random name generator.

I don't use ChatGPT and don't plan to. For me, part of the fun of running games is being creative and doing the work of coming up with stuff myself. I don't have as much of an issue with ChatGPT as with machine generated images, so that's not why I avoid it. I just think the creative work is part of the experience, and us humans can also do that far better than a computer program. ChatGPT can't easily draw on campaign-specific themes and symbolism, can't foreshadow the greater mysteries going on. I mean, it likely can if specifically prompted to, but then you're still doing most of the work myself.

And if I want to randomly generate something... Well, we're all into TTRPG's; that's what dice are for. (Or tarot decks. I have too many of those. They're just so pretty and I keep hoarding them.)

Are percentage-based skills hard to understand? I've played a bunch of BRP stuff (Call of Cthulhu/Delta Green), so it's basically second nature to me.

Though maybe it's because you're mixing d100 and d20 at that point...

In case you want to play D&D 5E but without supporting WotC while also having more customisation options: Check out Level Up: Advanced 5th Edition. It's also got its own thing for inspiration: during character creation, you pick – other than heritage, background, and culture – a destiny. It's what your character is meant to do, their story, their goals. This destiny gives you another means of gaining inspiration (things tied to your destiny) and a unique way to spend inspiration. (Also, you gain a special destiny feat when you accomplish a big thing related to your destiny!)