The Mediawiki Pipes extension implements external data access and processing through a series of configurable nodes that form a Pipe. The net effect is to create a Wiki based application framework. See http://www.mediawiki.org/wiki/Extension:Pipes
Rev = Really Easy Validation - write your form validation code once in this simple and powerful language that generates code for JavaScript, Perl, PHP, and Java. With Rev you get server side and client side data validation with no duplicated code.