Standalone webserver that handles incoming HTTP requests by calling a user-defined Postgres function. Allows webapps to be written entirely within Postgres without using any external framework.
Schema trigger support for PostgreSQL 9.3 -- extends CREATE EVENT TRIGGER with new events for table and column changes.
Datatypes and support functions for the web. (HTTP, URL, HTML, CSS.)
Provides a new kind of type, the function reference. (Really more of a "pointer", as any function with a compatible signature may be stored as a value of this type.)
Postgres extension providing an IMAGE datatype for the storage and manipulation of PNG and JPEG images (including EXIF metadata).
elephant.py - an object-relational interface to PostgreSQL.