Replika is probably the most prominent but I suspect more will be coming. Essentially, ChatBots that are much more sophisticated than previous iterations of them.

What are your overall thoughts on them?

At first I thought it was a terrible idea and retarded but after thinking about it, I kind of think it's a great idea to completely remove the need for intimate relations with the opposite sex and simply replacing it with an AI Chatbot.

The total progression of this would be adding the AI onto some sort of sexbot or android (way future). Eventually the need for a human companion could be entirely replaced. 2D might really come to life after-all.