10gen

10gen is a new platform-as-a-service technology designed to help developers quickly and easily build dynamic, scalable, mission critical web sites and applications. The 10gen software stack is analogous to Google App Engine in that it provides a new stack of tools (database, grid management, application server) that are purpose-built to run in a cloud environment. The 10gen system is great for small development projects, yet our design goal is tools powerful enough to run the largest web sites on the inter...

http://www.10gen.com/

server-side JavaScript, Ruby

http://b.hatena.ne.jp/entry/http://www.10gen.com/