Stable Baselines3 is a set of improved implementations of reinforcement learning algorithms in PyTorch. It is the next major version of Stable Baselines.
Github repository: https://github.com/DLR-RM/stable-baselines3
RL Baselines3 Zoo (collection of pre-trained agents): https://github.com/DLR-RM/rl-baselines3-zoo
RL Baselines3 Zoo also offers a simple interface to train, evaluate agents and do hyperparameter tuning.