Is there an equivalent to Sora now that it’s been taken down?

I am looking for a free app, similar to Sora, that will allow me to generate AI videos for free. No credits no daily system, nothing except the limits like Sora. If there isn't, what is the cheapest good option? Preferably something that operates on Sora. But I really like creating AI backrooms videos because the uncanny-ness of AI is really good at replicating the feel of them.