Usually refer to it as just "Meteor" but, in the form of a headline, "Meteor.js" feels a tad more descriptive. Even if someone has never heard of Meteor, they can see that it at least has something to do with JavaScript.
It doesn't matter how it feels, it matters how creators want it branded as - you need to honor their branding, casing, etc. I'm tired, for example, of seeing "Wordpress" or "memcache", when the proper name is "WordPress" and "Memcached", as an example.
Meteor has invested a lot getting the meteor.com domain, not meteorjs.com or similar cheaper alternatives.
It really does matter. People who don't pay attention to these details, don't pay attention to other details as well. It's not rally hard to honor the author's work and the way they want it named. It's a form of respect.
Meteor has invested a lot getting the meteor.com domain, not meteorjs.com or similar cheaper alternatives.