OpenAI Gym to me is the most popular platform for reinforcement learning research. And it has really been useful for me and my friends in our researche activities.

Gym is a playground for AI agent to learn to perform their task with flexible classes and customization to improve accuracy more and more. I compare my reinforcement learning algorithms like DDPG, DQN and PPO, while training Gym enhance my model abilities and train my model on different algorithms and compare batter preformed algorithms. Gym is open sourcre and it have classes and modules and custom environments for specific need and to simulate specialized task. overall Gym is feature rich and user friendly toolkit.

One of the best advancements is its work with multiple algorithms written in any framework. Gym provides me the ability to test my algorithms on high levels of complexity and many types of tasks. Gym API provides an interface of environments to compare the performance of different RL algorithms.