This list can be also found on my website and will be kept up to date there: https://wweb.dev/resources/websites-for-inspiration
Explore designs on Dribbble by color. This is really useful if you're looking for matching color inspiration.
A collaborative list of various pages around the web, which is mostly focused on SaaS pages.
A design gallery with carefully collected websites. It is sortable by landings, portfolios, blogs, stores, and others.
A website, which has landing page design inspiration, templates, resources and more. It can be filtered by category, color, and device.
Brand-focused collection of UI design examples. Sorted by categories like 404 pages, pricing pages, form pages and more.
A search engine for design inspiration. The search works with colors, keywords or style.
A small curation of creative portfolios made by designers & developers.
Hand-picked web design inspiration, chosen among different styles and industries. It can be filtered by desktop, mobile and tablet sites.
Web Design & UI Inspiration with Code Snippets, which is focused on specific elements.
A collection of hand-picked resources for front-end web developers.
A huge list of hand-picked inspirational websites, which is updated daily.
A website design gallery showcasing single page websites, templates, and resources.
A daily updated list for UI design inspiration, which can be filtered by specific elements.
An inspiration resource showcasing websites made by people from all over the world.
A list of hand-picked landing page inspirations from around the web.
A hand-picked collection of app store design screenshots.
A collection of landing pages with a focus on copywriting and design. It can be filtered by blocks like hero, navbar, cta, and more.
A curated list of landing pages, sortable by landing pages and pricing pages.
A list of landing page examples created by SaaS companies.
Let me know if I missed any important website for this list :)