Creating three different Django 3 full-stack websites using Python web development is an ambitious project. Each website can have its own unique purpose and features. Here, I’ll outline three potential Django 3 full-stack website ideas with a brief description for each:

1. E-commerce Website:
   1. Description: Build a comprehensive e-commerce platform where businesses can list and sell their products. Customers can browse products, add them to the cart, and complete the purchase.
2. Key Features:
   1. 1. User registration and authentication.
      2. Product listings with images, descriptions, and prices.
      3. Shopping cart and checkout functionality.
      4. Payment gateway integration.
      5. Order history and tracking.
      6. Product reviews and ratings.
      7. Seller accounts with product management capabilities.
      8. Admin panel for site management.
   2. Responsive design for mobile and desktop users.
3. Blog and Content Management System (CMS):
   1. Description: Develop a blogging platform and content management system for bloggers and content creators. Users can create, edit, and publish articles with rich text editing.
4. Key Features:
   1. 1. User authentication and role-based access (admin, editor, author, reader).
      2. Article creation and editing with a WYSIWYG editor.
      3. Categorization and tagging of articles.
      4. Comment system with moderation.
      5. User profiles with author bios and profile pictures.
      6. Search functionality.
      7. RSS feeds and email subscriptions.
      8. Media and image uploads for articles.
   2. Analytics and performance monitoring for authors and administrators.
5. Task and Project Management Tool:
   1. Description: Develop a web-based task and project management tool that allows teams to collaborate, assign tasks, set deadlines, and track project progress.
6. Key Features:
   1. 1. User registration and team creation.
      2. Task creation, assignment, and priority settings.
      3. Project boards with task cards and columns (e.g., To-Do, In Progress, Done).
      4. Deadline tracking and notifications.
      5. Comment threads for task discussions.
      6. File attachments and document sharing.
      7. User activity tracking and reporting.
      8. Kanban-style project management interface.
      9. User dashboard with task summaries and project overviews.
      10. Integration with calendars and notification systems.