Glue is the glue which attaches plugins. Plugins are Perl modules which you can create or Glue has implemented. Glue executes plugins accoding to a rule. The rule is written with simple syntax and the rule can be inheritated.
YATT.pm (or YATT) is Yet Another Template Toolkit for Perl. Like PHP (and unlike HTML::Template), YATT.pm converts each template into (executable) Perl package(class) so that you can define subs to build up your own abstraction architecture.