Open source AI Image Generation Tools
By 2026, the open-source AI image generation field had formed a thriving ecosystem centered around Flux.1 and Stable Diffusion (SDXL/SD3), supplemented by various native multimodal models and efficient WebUIs.
If you are preparing to build your own image generation service or perform secondary development, the following are the most noteworthy open-source project categories:
ComfyUI
LLM-Based Desktop & Browser Tools
The absolute top choice for developers in 2026. Although it has a learning curve, its high customizability and low memory usage make it the best solution for building automated image generation pipelines.
Fooocus
LLM-Based Desktop & Browser Tools
Minimalism, as simple as using Midjourney, with the developers having fine-tuned all the parameters for you at the underlying level.
ControlNet
LLM-Based Desktop & Browser Tools
Although it is an established project, its various versions of plugins remain the standard tools for precise control of pose, depth, and edges.
Stable Diffusion 3.5 / SDXL
LLM-Based Desktop & Browser Tools
Stable Diffusion 3.5 / SDXL is a state-of-the-art text-to-image model that generates high-quality images from textual descriptions.
Flux.1
LLM-Based Desktop & Browser Tools
The hottest open-source platform in 2025-2026, its Pro/Dev/Schnell versions surpass all earlier models in composition, color, and most importantly, "text rendering" capabilities.
FaceFusion / DeepFaceLab
LLM-Based Desktop & Browser Tools
Focused on high-quality face replacement and restoration, it will be widely used in video generation streams in 2026.
Forge / Automatic1111
LLM-Based Desktop & Browser Tools
The traditional web interface, the Forge version has undergone significant inference optimizations on SDXL and Flux.
IP-Adapter
LLM-Based Desktop & Browser Tools
No model fine-tuning is required; simply provide a reference image, and the AI can mimic the layout or style of that image.
OmniGen
LLM-Based Desktop & Browser Tools
OmniGen is a versatile text-to-image generation tool that leverages advanced AI models to create high-quality images from textual prompts.