The best replacement for terracotta is coherence.

The best alternatives to terracotta are rated as following:
★★★★★  coherence
★★★★★  ehcache
★★★★  gemfire
★★★  hazelcast
★★  saltillo
★★  memcached
★★  terra cotta
★★  clay
★★  concrete roof tiles
★  gigaspaces
★  infinispan
  persimmon
  nars laguna
  quarry tile

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Speaking about terracotta, one probably shouldn't forget about ehcache.

Other search terms related to terracotta and their ratings are:
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Google Trends

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terracotta
coherence
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