I use it for many side projects, and I am starting to use it for bigger ones too.

Should we submit personal projects and smaller side projects, or is this for fully fledged app only?

Also, should we add know open source applications such as Plausible[1]?

I am always happy to see Elixir and Erlang hit the front page.

[1] - https://github.com/plausible/analytics

Yes to all of the above. The goal is to share as much as possible what people are doing with Elixir.

Just personal opinion, I would get a lot of value out of having open source projects on there like plausible. I'm fact that might be the most useful thing personally