I feel like they've really changed how they are presenting themselves but Runway was the big one that came to mind for me that focus on more than simple video generation but actually meant for film makers.

This is the best page I found- maybe there's a better one...

https://runwayml.com/product

But its interface looks like a video editor- timeline, etc

I’m curious as well.

I’ve been exploring this space for a potential project - curious to see what these startups are doing