XWStats is a great resource for advanced tracking of your own stats as well as comparisons to others. Go to a given puzzle's individual page to see the median solve time for that day - for example, the median solve time for Sunday 3/5 was 20:57. (Note that the site can only track times among those who have created XWStats accounts, which I imagine is a pretty dedicated group of crossword nerds, so the median solve... Source: over 1 year ago

I kind of doubt it, but XW stats does try to track this through user input. I suppose someone could try to train a model to compare new puzzles to ones in the database for an estimate of difficulty. Source: over 1 year ago

Burst - This a free library from shopify to help ecommerce owners find stock content. Source: about 1 year ago

Burst is a website owned by Shopify that provides an extensive collection of free, high-resolution images that can be used for personal and commercial projects. The images on Burst are licensed under the Creative Commons Zero (CC0) license. The website also offers a "Collections" feature where users can find curated sets of images on specific topics or themes. Additionally, Burst has an API for developers to... - Source: dev.to / over 1 year ago

Burst– Free stock photos for websites and commercial use. Source: over 1 year ago

You can buy stock cat photos or even use Shopify's Burst free photo library: https://burst.shopify.com/. Source: almost 2 years ago

- use stocks (burst.shopify.com for example). Source: almost 2 years ago