Is Dropbox still free to use?

I've been using Dropbox for years now, and it's been a great tool for sharing files and collaborating with my team. But recently, I've been hearing rumors that Dropbox is no longer free to use. Is this true? If so, what are the pricing options, and are there any other free alternatives that I should consider? I'm really concerned about losing access to my files and having to switch to a different service.