SoundCloud and LANDR Partner for Free Online Mastering (landr.com)

Here's a link to a write-up discussing what the service is about / context:

http://consequenceofsound.net/2016/05/soundcloud-is-now-offe...

I can dig this.. though LANDR will never be a replacement for "true" Mastering it is a pretty great service for independent musicians to get decent mixes out quickly and affordably