A big draw of this particular article is the beautiful animations to go along with the explanations. They're pretty good at showing the consequences of certain parts of the algorithm; such as why a sequence number is needed.

Distributed systems algorithms are particularly in need of better/more digestible visualization and pedagogical tools. Anyone know of any others? Raft has a few, but there are variants of Paxos, Multi-Paxos, Zab, View-stamped Replication.