7 Best RLLM Alternatives (Self-Hosted)

rLLM is an open-source framework for training language agents with reinforcement learning. Bring any harness, run it in any sandbox, and switch training backends with one flag — the same agent code drives both eval and training. Includes 60+ integrated benchmarks, multiple RL methods such as GRPO, REINFORCE and RLOO, and battle-tested results like DeepScaleR-1.5B and DeepCoder-14B.