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* [[Google]] has developed ''Chubby'', a lock service for loosely coupled distributed systems.<ref name="chubby">[http://research.google.com/archive/chubby.html Google Research Publication: Chubby Distributed Lock Service]. Research.google.com. Retrieved on 2013-09-18.</ref> It is designed for coarse-grained locking and also provides a limited but reliable distributed file system. Key parts of Google's infrastructure, including [[Google File System]], [[Bigtable]], and [[MapReduce]], use Chubby to synchronize accesses to shared resources. Though Chubby was designed as a lock service, it is now heavily used inside Google as a [[name server]], supplanting [[Domain name system|DNS]].<ref name="chubby" />
* [[Apache ZooKeeper]], which was created at [[Yahoo]], is open-source software and can be used to perform distributed locks<ref name="zookeeper">[http://zookeeper.apache.org/doc/trunk/recipes.html#sc_recipes_Locks ZooKeeper Recipes and Solutions]. Zookeeper.apache.org. Retrieved on 2013-09-18.</ref> as well.
* etcd is open-source software, developed at [[CoreOS]] under the Apache License.<ref name="CoreOS">{{cite web|url=https://coreos.com/|title=CoreOS|website=coreos.com}}</ref> It can be used to perform distributed locks as well.<ref name="etcd">[https://github.com/coreos/etcd/blob/master/Documentation/demo.md#distributed-locks]. Retrieved on 2016-09-20.</ref>
* [[Redis]] is an open source, BSD licensed, advanced key-value cache and store.<ref name="redis">http://redis.io/ Retrieved on 2015-04-14</ref> Redis can be used to implement the Redlock Algorithm for distributed lock management.<ref name="redlock">{{Cite web|url=http://redis.io/topics/distlock|title=Distributed locks with Redis – Redis|website=redis.io|access-date=2015-04-14}}</ref>
* HashiCorp's Consul,<ref name="consul">[https://consul.io/ Consul Overview]. Retrieved on 2015-02-19.</ref> which was created by [[HashiCorp]], is open-source software and can be used to perform distributed locks as well.
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