I've written many over the years. Not all were published and some of them I don't use anymore. Anyway, here are a few examples:

* `inlinehashes`[1] - To help build the CSP of websites that I don't control the source/development.

* `worker-ddns` [2] - simple DDNS solution using cloudflare workers

* `kinspect` [3] - a web tool to quickly inspect PGP keys without importing them to my keyring.

[1] https://github.com/dethos/inlinehashes

[2] https://github.com/dethos/worker-ddns

[3] https://kinspect.ovalerio.net/