phpPgAdmin is a fully functional PHP-based administration package for PostgreSQL. It has all the basic functionality you need to completely administer a PosgreSQL server and/or database, including the ability to administer views, sequences, stored procedures, and triggers. Features include the ability to create and drop databases; create, copy, drop, and alter tables/views/sequences/functions/triggers; edit and add fields (to the extent Postgres allows); execute any SQL-statement, even batch-queries; manage keys on fields; create and read dumps of database and tables; and administer one single database, multiple servers, and Postgres users/groups.
Postlister is yet another PHP/SQL mailing list program. It features an unlimited number of lists, subscription confirmation, no browser time-out, different signature for each list, language files, and a password-protected browser-based administration area that allows you to create/delete/edit lists, find/add/delete subscribers, and preview/send mail to the list(s).