Webframe is a great tool to discover beautiful Web App designs for inspiration.
Dribbble is the leading destination to find & showcase creative work and home to the world’s best design professionals.
Collect UI is a platform for your daily inspiration collected from daily UI and beyond. Based on Dribbble shots, hand picked.
Pages.xyz is a curated list of the best web page designs for your inspiration. They bring you everything you need to see in a single place.