Is anyone aware of FOSS alternatives to Google Tag Manager?

I have a really simple use case where I'm trying to find a solution that can trigger tags based on:

• click class
• click ID
• click text

My tags simply fire javascript events to Plausible Analytics for tracking a few different web conversion scenarios.

In the past, I've tried Scale8 (it seems to have folded). I'm aware of Matomo's tag manager, but I already have an analytics solution, so I'm not really interested in deploying their analytics platform just for the tag manager plugin.

I recently came across RudderStack, but it doesn't seem to meet my simple needs. Or, if it does, its learning curve seems high.