Architect is the most powerful and easiest to use page and html builder not only on codecanyon, but probably on the internet. It has all the features you would want except for page builders, while offering exclusive features like themes and templates, tightly integrated code editors, the best visual css and image editor, and much more.

1. Responsive Design: Ensure that the website layout adapts to different screen sizes and devices, such as desktops, tablets, and smartphones.

2. HTML5 and CSS3: Use the latest web technologies to build modern and efficient web pages. HTML5 and CSS3 offer improved functionality and styling capabilities.

3. Drag-and-Drop Interface: Create an intuitive interface that allows users to drag and drop elements like text, images, and widgets onto the page. This simplifies the site-building process for non-technical users.

4. Customization Options: Offer a wide range of customization options for fonts, colors, backgrounds, and layouts to allow users to personalize their websites.

5. Templates and Themes: Provide a library of pre-designed templates and themes that users can choose from as a starting point for their websites.

6. Media Integration: Allow users to easily embed and manage images, videos, audio, and other media elements in their web pages.

7. Widgets and Plugins: Support the addition of widgets or plugins for extended functionality, like contact forms, social media integration, and e-commerce features.

8. SEO Tools: Integrate SEO (Search Engine Optimization) features to help users optimize their websites for search engines, including meta tags, sitemaps, and URL structure.

9. Mobile Editing: Enable users to make on-the-go edits and updates to their websites through mobile-friendly interfaces or dedicated mobile apps.

10. Collaboration and User Management: If your site builder is used by teams or businesses, implement features for collaboration and user management, including permissions and access controls.

11. Version Control: Include version control options so users can track changes and revert to previous versions of their websites.

12. E-commerce Capabilities: If applicable, integrate e-commerce functionality, such as shopping carts, payment gateways, and product catalog management.

13. Blogging and Content Management: Support blogging features, content scheduling, and content categorization for users who want to publish regular updates.

14. Analytics and Insights: Provide tools for users to track website performance, including visitor statistics, conversion rates, and other key metrics.

15. Security: Implement security measures to protect websites from common online threats, including data breaches and hacking attempts.

16. Domain and Hosting Integration: Allow users to connect their custom domains and seamlessly integrate with hosting services.

17. Customer Support and Documentation: Offer comprehensive documentation and customer support to assist users in troubleshooting issues and making the most of the platform.

18. Accessibility Features: Ensure that the site builder and the websites it produces are accessible to all users, including those with disabilities.

19. Integration with Third-Party Services: Enable integration with popular third-party services like email marketing platforms, CRM systems, and social media networks.

20. Backup and Restore: Provide options for users to back up their websites and easily restore them in case of data loss.