Open source side project to serve a real need I had:

I use n8n a lot for automations, and sometimes it's helpful to have a human (myself) in the loop. New customers signs up? Open their LinkedIn profile automatically in my browser. New article in an RSS feed I care about, open it in a browser tab near real time.

Hope it's helpful for others! Can be self-hosted, and is built in a data-sparse way (minimal data retention/logging) so nothing is stored beyond what's required for the functionality.