While we're approaching the 1.0 release of Meteor, the need and interest in additional databases support (other than MongoDB) has risen consequently. Thus, SQL support is the second most requested feature on the official meteor roadmap (after server-side rendering) and there have been various demands on the forums about supporting Redis (also on the roadmap), RethinkDB, LevelDB, Neo4J, ElasticSearch, Mysql/MariaDB, PosgreSQL, SQLite and some other. More importantly the Meteor community has started to work on atmosphere packages that bring support for these databases and it appeared to be a very difficult task – most projects were abandoned.
What makes the integration of a new database a lot harder in Meteor than in most other web frameworks (including “full stack” JavaScript frameworks like Derby or Sails) lies in the third [principle of Meteor](http://docs.meteor.com/
