There are several free AI image generator tools available without any trial period limitations. Some of the best ones include Visme, DALLE, Craiyon, Midjourney, Jasper Art, NightCafe, Deep AI, Bing Image Creator, Dreamify, Vaslou, GoCharlie AI, and Kapwing AI. These tools allow users to create a wide range of images such as photos, paintings, pencil drawings, 3D graphics, icons, and abstract art. Some of these tools offer a limited number of free image generations per month, while others offer unlimited image generation. Users can choose the tool that best fits their needs and preferences. It's worth noting that the quality and accuracy of the generated images may vary depending on the tool used and the complexity of the image prompt.