Will there be Steins Gate Season 3?
No, there will not be a Season 3 of Steins;Gate. No announcement for a Season 3 has been made. As we know the series concluded after Season 2 and Episode 24. Additionally, we already know the events that take place after the series ended thanks to the OVA episode 25.
Is Steins Gate anime finished?
Steins;Gate is entirely finished on its own, so the answer is very likely 99%, no it won’t. Edit: Do know that a new project was announced recently but it’s marketed as a “spiritual successor” and not a sequel to Steins;Gate. Steins;Gate story in itself is entirely finished.