Open Source Alternatives
Open source alternatives to Colossal-AI
Open source alternatives to Colossal-AI, ranked by GitHub stars and freshness.
10 open-source alternatives in the index, ranked by GitHub stars and freshness.
unslothai
Community
Unsloth Studio is a web UI for training and running open models like Gemma 4, Qwen3.6, DeepSeek, gpt-oss locally.
Best for: Developers who want to fine-tune or experiment with open models locally without cloud costs.
DeepSpeed
Community
DeepSpeed is a deep learning optimization library that makes distributed training and inference easy, efficient, and effective.
Best for: Teams training large models who need to maximize GPU efficiency and scale across multiple devices.
Megatron-LM
Community
Ongoing research training transformer models at scale
Best for: ML engineers training large transformer models who need production-grade distributed training infrastructure
torchtitan
Community
A PyTorch native platform for training generative AI models
Best for: Teams using PyTorch to train custom generative AI models at scale
nanotron
Community
Minimalistic large language model 3D-parallelism training
Best for: Researchers and engineers who need a simple, hackable framework for distributed LLM training experiments.
maxtext
Community
A simple, performant and scalable Jax LLM!
Best for: Developers already using Jax who need a streamlined, scalable LLM training framework
Megatron-DeepSpeed
Community
Ongoing research training transformer language models at scale, including: BERT & GPT-2
Best for: Researchers and engineers training large-scale transformer models in distributed environments
BMTrain
Community
Efficient Training (including pre-training and fine-tuning) for Big Models
Best for: Developers and researchers training or fine-tuning large models who need a specialized, efficiency-focused Python framework
ZeRO: Memory Optimizations Toward Training Trillion Parameter Models
Community
Microsoft
Best for: Researchers and engineers training very large models on distributed GPU clusters
Megatron-LM: Training Multi-Billion Parameter Language Models Using Model Parallelism
Community
Megatron-LM
Best for: Researchers and engineers training very large transformer-based language models.