CSS FilterLab By Adobe – Explore CSS Filters And CSS Custom Filters
CSS FilterLab is a free-to-use online application, created by Adobe, for discovering CSS Filters & CSS Custom Filters.
It allows us to apply any number of filters from a list, customize their values, see the output instantly and get the CSS rules generated.
There is also an "animate" feature which makes it possible to create keyframe based animations using the filters and save them for future use.
The application is also open sourced and available through GitHub.