Scalaris
From the webpage:
Scalaris is a scalable, transactional, distributed key-value store. It can be used for building scalable Web 2.0 services.
Scalaris uses a structured overlay with a non-blocking Paxos commit protocol for transaction processing with strong consistency over replicas. Scalaris is implemented in Erlang.
Following http://www.zib.de/CSR/Projects/scalaris I found:
Our work is similar to Amazon’s SimpleDB, but additionally supports full ACID properties. Dynamo, in contrast, restricts itself to eventual consistency only. As a test case, we chose Wikipedia, the free encyclopedia, that anyone can edit. Our implementation serves approx. 2,500 transactions per second with just 16 CPUs, which is better than the public Wikipedia.
Be forewarned that the documentation is in Google Docs, which does not like Firefox on Ubuntu.
Sigh, back to browser wars, again? Says it will work with Google Chrome.