Here is the assortment of astounding sites you will check most likely. As they have exceptionally astounding UI/UX and will move you to make something cool like them or better than them.

Website Inspirations

Awwards - Awwwards are awarded for 'design, creativity, and innovation for the internet.

Landbook - Land Book is a large gallery of product landing pages.

Empty States - Empty States is a site devoted to showcasing website and mobile app empty states.

Designspiration - Designspiration is a seemingly-random wall of creative projects.

Mobile App Inspirations

Dribbble - Born out of Salem, MA, Dribbble has grown to become a hub for designers to share their work, meet other designers, and get inspired.

Behance - Behance is a great spot to build up and display a design portfolio and find inspiration from other designers.

Uplabs - Uplabs is a community for designers to share and sell their work.

Mobbin - Mobbin is a hand-picked collection of the latest mobile design patterns from apps that reflect the best in design.