I have run testing on large software programmes for more than twenty years: pension transitions, government systems, media, finance and retail. On every assignment I ended up building the same things: a test plan that people actually fill in, a traceability matrix that proves coverage, a defect tracker with a dashboard the steering committee can read, and a UAT package that ends in a signed go/no-go. These are those files, cleaned up so any team can use them.
The developer cheat sheets come from the same habit. I write down the patterns I keep looking up, with the code example and the gotcha next to it. Everything in this shop is made and supported by me, Toine Schoenmaekers, through Toine.com B.V. in Utrecht, the Netherlands. If something does not work the way the listing says, message me and I will fix it.