Looking for some examples of landing pages for a saas that isn't available yet

I've been working on a saas product on and off for a while. It's a 'scratch-your-own-itch' type that I've been evolving over a couple of years. But, I've now given myself a deadline to have launched at least something by Christmas.

So, I want to get a landing page published to gauge the level of interest, collect email addresses, etc.

Was hoping people can share examples of landing pages for products that don't exist yet.

Thanks :)