~/shop/standalone
21 of the 29 scripts in the catalogue run on Standalone. Standalone means the script does not need ESX or QBCore to run at all. That matters for two kinds of server: the ones still choosing a framework, and the ones deliberately not using one. Where a script is standalone it still detects a framework if you install one later, so nothing has to be reinstalled when your stack changes.
Standalone does not mean dependency-free. Anything that saves data still needs oxmysql, and anything with a shop still needs somewhere for money to live. The product page for each script lists what it actually requires on a bare server.
That it runs without ESX or QBCore. Player money, jobs and identity are either not used at all, or handled by the script itself. It does not mean zero dependencies — oxmysql is still needed wherever data persists.
Yes. Framework detection happens at boot, so installing ESX or QBCore afterwards is picked up on the next restart. Nothing needs to be re-downloaded and no config is thrown away.
Usually a little, because there is no framework round-trip on every money or job call, but the difference is small next to how the script itself is written. Every product page publishes its measured resmon, and the test server lets you check it yourself.