Here's a list of major AI text-to-image generation platforms, including some hidden and lesser-known ones.

1. Mainstream Platforms

DALL-E 3 (OpenAI): Offers high-quality image generation, but requires access permission. DALL-E 3
Midjourney: Provides powerful image generation features, but requires a Discord account and a paid plan. Midjourney
Stable Diffusion: Open-source model, requires technical knowledge to run locally or on the cloud. Stable Diffusion
Craiyon (formerly DALL-E Mini): Offers fast image generation, but quality and customization options are limited. Craiyon
NightCafe Creator: Provides multiple styles and customization options, but has free usage limits. NightCafe Creator
Artbreeder: Offers image generation based on genetic algorithms, requires a paid plan to unlock full features. Artbreeder
WOMBO Dream: Provides fast and fun image generation, but quality and customization options are limited. WOMBO Dream
StarryAI: Offers multiple styles and customization options, has free usage limits. StarryAI
Leonardo.Ai: Provides high-quality image generation, but requires access permission. Leonardo.Ai
PromptHero: Offers prompts and inspiration for image generation, but doesn't generate images itself. PromptHero

2. Other Platforms Worth Exploring

DreamStudio (Stability AI): Based on Stable Diffusion, has free usage limits. DreamStudio
Fotor AI Image Generator: Offers multiple styles and customization options, has free usage limits. Fotor AI Image Generator
Let's Enhance: Provides image enhancement and generation features, requires a paid plan. Let's Enhance
Topaz Gigapixel AI: Image upscaling and generation, requires payment. Topaz Gigapixel AI
Luminar AI: Offers image editing and generation features, requires payment. Luminar AI
Affinity Photo: Offers image editing and generation features, requires payment. Affinity Photo
Corel Painter: Offers digital painting and generation features, requires payment. Corel Painter
Clip Studio Paint: Offers digital painting and generation features, requires payment. Clip Studio Paint
Rebelle: Offers watercolor painting and generation features, requires payment. Rebelle
ArtRage: Offers traditional painting and generation features, requires payment. ArtRage

3. Hidden and Unknown Platforms

Emu3: A multimodal AI model developed by the Beijing Academy of Artificial Intelligence, capable of integrating text, image, and video modalities. (Refer to provided sources for details).
text-to-image: An open-source project by developer Paarth Neekhara using advanced machine learning to convert text descriptions into realistic images. (Refer to provided sources for details).
Fliki: Free AI image generator that can convert text into beautiful AI-generated images. Fliki
ImgGen: Free online AI image generator that can generate high-resolution images without watermarks. ImgGen
KreadoAI: Free AI image generator based on professional and well-trained large language and image generation models. KreadoAI
Artlist.io: Offers a powerful AI image generator that can turn text into stunning visuals. Artlist.io

4. Other Related Platforms

DeviantArt: Artist community offering image generation and sharing features. DeviantArt
Behance: Designer community offering image generation and sharing features. Behance
Dribbble: Designer community offering image generation and sharing features. Dribbble
ArtStation: Artist community offering image generation and sharing features. ArtStation
Society6: Artist community offering image generation and product customization features. Society6
Redbubble: Artist community offering image generation and product customization features. Redbubble
Teespring (now Spring): Artist community offering image generation and product customization features. Spring
Printful: Artist community offering image generation and product customization features. Printful
Zazzle: Artist community offering image generation and product customization features. Zazzle
Spreadshirt: Artist community offering image generation and product customization features. Spreadshirt

5. Emerging Platforms

DiffusionBee: A user-friendly desktop application based on the Stable Diffusion model, allowing users to generate high-quality images locally. DiffusionBee
InvokeAI: An open-source AI image generation tool offering flexible customization options and multiple generation models. InvokeAI
Stable Diffusion Web UI: A web-based interface for running Stable Diffusion models, providing easy-to-use image generation features. Stable Diffusion Web UI (AUTOMATIC1111)
Automatic1111's Web UI: A popular fork of the Stable Diffusion Web UI, offering additional features and an improved user experience.
DreamUp (DeviantArt): DeviantArt's AI image generation tool, allowing users to generate and share images directly on the platform. DreamUp

6. Lesser-Known Platforms

VQGAN+CLIP: An image generation tool combining the VQGAN and CLIP models, capable of generating high-quality images from text descriptions.
StyleCLIP: An image generation tool based on the CLIP model, allowing users to control the style of images through text descriptions.
BigGAN: A powerful Generative Adversarial Network (GAN) model capable of generating high-resolution and high-quality images.
GANbreeder (now Artbreeder): A GAN-based image generation tool allowing users to create new visuals by mixing and mutating images. (See Artbreeder above) Artbreeder
Artomatix: A platform offering AI-driven image generation and editing tools, including texture generation and 3D model creation features. Artomatix (Note: Artomatix was acquired by Unity)

7. Specialized Domain Platforms

DeepArt.io: An AI image generation tool focused on artistic creation, allowing users to transform their photos into artistic styles. DeepArt.io
Prisma: A popular mobile application that uses AI technology to transform photos into artistic styles. Prisma
Ostagram: A platform offering artistic style image generation, allowing users to transform their photos into various art styles.
DeepStyle: A deep learning-based image generation tool capable of transforming images into specific artistic styles.
NeuralStyler: A platform offering artistic style image generation, allowing users to transform their photos by selecting different art styles.

8. Education and Research Platforms

Google Colab: A cloud-based notebook environment allowing users to run and experiment with various AI models, including image generation models. Google Colab
Kaggle: A data science and machine learning competition platform offering various AI image generation challenges and datasets. Kaggle
Hugging Face: A platform providing pre-trained AI models and tools, including various image generation models. Hugging Face
Papers with Code: A platform providing AI research papers and related code, including many studies on image generation. Papers with Code
GitHub: A code hosting platform where many open-source AI image generation projects and models are published and shared. GitHub

9. Business Application Platforms

Adobe Creative Cloud: Adobe's suite of creative tools, including Photoshop and Illustrator, now integrating AI image generation features (e.g., Firefly). Adobe Firefly
Microsoft Designer: Microsoft's design tool utilizing AI technology to offer image generation and design suggestions. Microsoft Designer
Canva Pro: The paid version of Canva, offering more AI image generation features and advanced design options (Magic Media). Canva
Figma: A popular design tool now integrating AI image generation features to help designers work more efficiently (via plugins). Figma
Sketch: A vector graphics editor focused on UI/UX design, now also offering AI image generation features (via plugins). Sketch

10. Other Interesting Platforms

This Person Does Not Exist: A platform generating realistic human face images using GAN technology to create people who don't exist. This Person Does Not Exist

These platforms offer a variety of features and services to meet different user needs. Whether you're looking for free AI tools or willing to pay for advanced features, these platforms are worth exploring. Please note that some platforms may require registration or specific conditions to use their features. When using these tools, ensure you comply with the platform's terms of use and community guidelines.