First on the list is MidjourneySref, a collection of more than 100 carefully crafted sref code effects designed for use with MidJourney. The collection of sref code effects lets artists and other creators find and use the best sref codes to ensure a consistent look and get the precise visual results they want. It's free to use and lets you quickly mark and save your favorite sref codes.
Another good option is Leonardo, an AI image generator that produces high-quality images at large scale with a consistent style. It comes with features like AI Canvas for editing, 3D texture generation and fine-tuned models for styles like anime and photorealism. Leonardo also offers a free tier with daily tokens, so it's accessible and easy to use for anyone, whether you're a creator or developer.
For a more collaborative approach, Facet is an AI image generator and editor that can generate images in real time and then edit them. It's geared for control over image elements, with spatial prompts and auto-enhanced image prompts, so it's good for creative pros who want to benefit from AI creativity but also steer their work. Facet has a free starter tier and several paid options for different needs.