lisp -lang
postgres -db
python -lang
supervise -monitor
sloney -db-replication
memcached -cache
spread -cache-sync
thingdb -table-structure
haproxy -load-balancer(logged-in-users)
akamai -cdn(logged-out-users)
s3/nginx -static-content
londiste -replicate-commands
memcachedb -persisted-cache
cassandra -db
zookeeper -locking
hadoop -mapreducer
rabbitmq/amqp -queueing