The Paxos algorithm is widely used in modern distributed systems for achieving consensus among nodes. Some of the well-known systems and services that use the Paxos algorithm or its variants are:

   1 Apache ZooKeeper - an open-source distributed coordination service used for maintaining configuration information, naming, and providing distributed synchronization.

  2  Google's Chubby - a distributed lock service used for mutual exclusion and coordination among nodes.

  3  Amazon's DynamoDB - a distributed NoSQL database service that uses a variant of Paxos for maintaining consistency among replicas.

  4  Microsoft Azure's Cosmos DB - a globally distributed, multi-model database service that uses the Paxos algorithm for achieving consensus among nodes.

  5  Ethereum blockchain - a distributed public blockchain that uses a modified version of the Paxos algorithm for consensus.

Overall, the Paxos algorithm has become a fundamental building block for many distributed systems and services that require reliable and consistent coordination among nodes.
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