WP Page Builder - A free, fast and intuitive WordPress page builder
Muzli - UI/UX and Design Inspiration Chrome Extension
Elementor - Elementor is a front-end drag & drop page builder for WordPress.
UI Garage - Specific mobile and web design patterns for your inspiration
Slider Revolution - Slider Revolution is more than just a WordPress slider. It helps beginner-and mid-level designers WOW their clients with pro-level visuals.
Design Hunt - Curated design inspiration for everyone