I remember one tweet from Mikeal several years ago when he said that OSS have opened up so many doors and given so many opportunities for him and I will remember him with that, because he opened the door for me too, first by making me a collaborator in request (the Node.js module) and then by connecting me with the CEO of the company that I work for. And note that we never knew each other in person, he did it for someone who is literally on the other side of the world, I think that speaks a lot.
I'm happy that so many people remember him, because this is what a community is all about, and he was very much invested into creating one.