SnapLogic is a modular Data Integration Server based on REST principles.
mod_okioki is an Apache HTTPD module that makes it easy to define a RESTful data service in combination with a PostgresQL database. Definition of a service consists of pairing an URL with an SQL statement in the Apache configuration file.
Standards-compliant Java persistence via JDO/JPA/REST and RDBMS/MongoDB/Neo4j/Excel/LDAP.
An EncFS CLI manager.