What does HackerNews think of riak_cs?
Riak CS is simple, available cloud storage built on Riak.
S3
[A1] https://github.com/jubos/fake-s3
[A2] https://github.com/scality/s3
[A3] http://s3ninja.net/
[A4] https://github.com/basho/riak_cs
[A5] https://www.npmjs.com/package/s3rver
[A6] http://ceph.com/ceph-storage/object-storage/
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SQS / SNS
[B1] https://github.com/iain/fake_sqs
[B2] https://github.com/yourkarma/fake_sns
[B3] https://github.com/adamw/elasticmq
[B4] https://github.com/p4tin/goaws
[B5] http://stratosphere.codeplex.com/
[B6] https://github.com/unbounce/yopa
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DynamoDB
[C1] https://github.com/mhart/dynalite
[C2] https://github.com/ananthakumaran/fake_dynamo
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SimpleDB
https://github.com/basho/riak_cs
If any experts happen to notice particularly good or heinous examples in this source code, it'd be interesting to point them out.