Promises/A+ - promisesaplus.com
Releases on github repo :
1.0.0
1.1.0
1.2.0
implementation list on the promisesaplus.com website
Promises for asynchronous programming - exploringjs.com/es6
Promises chaining - javascript.info
Promise error handling in-depth - 20170924
Promise visualization playground for the adventurous
Do never resolved promises cause memory leak? - stackoverflow.com - 20160129