Cool new microservice from Remy Sharp. I can see some use here for quick and dirty prototyping of ideas or wiring up a few of my Arduino projects to use it as a data store.
Good list of some CSS properties and what can be achieved with just CSS put together by Greg Hovanesyan. Good resource to browse through.
Not as big of a change as ES6 was, but exciting nonetheless.
I have yet to find the best tool or figure out the best method for keeping things aligned well when working on team projects. Dropbox Paper looks pretty good, but reminds me a lot of Basecamp.