Data Base Management Systems of which AQT is aware of the catalog structure include IBM DB2, Oracle, Microsoft SQL Server, Postgres, MySQL, Sybase, and Informix.
He is an open source developer and the author of several extensions to the Perl programming language, including PerlVision, Crypt::GPG, Crypt::Schnorr::AuthSign, Persistence::Database::SQL and Persistence::Object::Postgres.