This site is like a mass library of stock photos from different sites, not just stock images but can also videos and icons. Not all of those are free so you might need to pay for the content of some of those.
There are other categories of sites that are listed as well – lots of other tools that can help you in your every day digital creative work. Just an example – colour tools helping you pick among different colour palettes and pick what you like for your needs.
Typography and illustrations oriented sites are there too!
In addition to that if you want to add animations to your website, you can also get them other sites lister here.
There are also builders where you can download or create templates for your site.
There is also an educational side of the site – for instance there are UX research and designer podcasts.
Another amazing category that exists is the wireframing tools. You ought to try some of those!
Licensing for provided resources: A lot of them are paid
Registration required: no
Handy search and filtering: yes
Here’s a link to the site: The Stocks 3