utf8proc is a library for processing UTF-8 encoded Unicode strings. Some features are Unicode normalization, stripping of default ignorable characters, case folding, and detection of grapheme cluster boundaries. The library can be used in C programs, but most of the functionality is also available as a ruby library. For PostgreSQL, there is an extension providing a function for preparing strings in case insensitive indices. The currently supported Unicode version is 5.0.0.
Momomoto is an object-relational mapper written in Ruby for PostgreSQL. It features support for combined primary keys, support for stored procedures, and support for schemas. Metadata for tables, views, and stored procedures are fetched directly from the database to keep declaring classes as simple as possible.