This report offers an in-depth analysis of mainstream open-source uncensored (NSFW) large language models (LLMs) whose weights are publicly available for download and modification. We explore the technical definitions of “NSFW” and “uncensored” in the context of text generation, highlighting the motivations behind community-driven development. The report outlines the current ecosystem, from foundational models by big tech companies to independent developers who remove safety alignment for unrestricted use. We cover key software tools, user interfaces, and the vibrant online communities shaping the field. If you want a comprehensive look into this rapidly evolving and often misunderstood AI niche, this is your starting point.