Profile Sticker lets a user add a sticker from the available options to their profile picture and later download the processed picture or lets the user post the picture to Facebook.
Find all the required information here - https://github.com/profilesticker/profilesticker.github.io/wiki/Contribute
Accurate cross-browser testing for all desktop and mobile devices in the cloud. BrowserStack is the perfect tool you would need to ensure that you develop and test for all client alike.
Developed by Clyde D'Souza https://clydedsouza.net/. More credits available at https://github.com/profilesticker/profilesticker.github.io/wiki/Credits.