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Apache ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. It uses znodes for service registration and discovery.

DNS-Based Discovery uses the Domain Name System to translate human-readable hostnames to IP addresses. Services register their location in DNS, and clients use DNS queries to locate services.

Etcd is a distributed key-value store that provides a reliable way to store data across a cluster of machines. It's commonly used for shared configuration and service discovery in distributed systems.

Gossip protocols are used in distributed systems for peer-to-peer information dissemination and are based on the principle of epidemic information spreading. They are robust in failure scenarios and do not rely on a centralized registry.

Consul provides service discovery, health checking, Key/Value store, and supports multi-datacenter deployments. Services register with Consul and clients query Consul to discover services.

Multicast DNS (mDNS) resolves hostnames to IP addresses within small networks that do not include a local name server. It's used for automatic service discovery in local networks and operates similarly to standard DNS.

Eureka is a REST-based service used for locating services for the purpose of load balancing and failover of middle-tier servers. Clients register instances with Eureka and other clients query Eureka to find instances.