I have a few links

  * http://book.mixu.net/distsys/single-page.html
  * http://the-paper-trail.org/blog/distributed-systems-theory-for-the-distributed-systems-engineer/
  * http://www.hpcs.cs.tsukuba.ac.jp/~tatebe/lecture/h23/dsys/dsd-tutorial.html
  * https://henryr.github.io/distributed-systems-readings/