User Scripts!
These are my Tampermonkey/GreaseMonkey User Scripts.
They automatically get published to my account on OpenUserJS using a webhook. And autoupdates are supported so installing from there is recommended.
They are rather specific to particular web sites, but you could find them useful.
I recommend using them with Tampermonkey, an extension for eevery major browser. But they will work with Greasemonkey and anything that supports user scripts.
Here is a small guide about how to get started with user scripts.
Have fun and don't accidentally install any malicious scripts!