There are several collections out there, mostly screenshots from existing platforms. This is what I found so far:

- https://screenlane.com/ - https://www.designencyclopedia.io - https://www.darkmodedesign.com/ - https://uigarage.net/ - https://www.checklist.design/ - https://pageflows.com/ - https://mobbin.design/patterns - http://ui-patterns.com/ - https://collectui.com/