I’ve been writing an article about concurrent editing using operational transformation within Meteor. It is the first part of a longer series, as I want to try out at least one of the mentioned alternatives:
Also available on our blog: https://qnipp.com/en/2019/02/concurrent-editing-with-meteor/
Sorry, this time no German version 
Nice and quick to the point!
I wish that ShareJS would have been updated or the promised upgrade as descried at the end of this blog post: https://josephg.com/blog/forki/
I’m currently re-writing my app, so when I get around to my editor this is something I will need to implement. It would be great if we could get/make something specifically for Meteor. Given DDP it is just asking for it.
I’ll try to implement the second alternative in the next few days. As soon as the package is available, I’ll announce it here.