List of Tech Migrations

I'm quite fascinated with the decision (and obviously the effort) of leaving a language or database to another technology, here's the list that I found:
So many migrating to Go ^^. If it's not about migration, there's a lot more here that apparently choose Go (interviews also more here).

Btw why not MongoDB.. but I think now they getting better.

If you found any more news like this, paste the link on the comment, I'll gladly add them on the list.