NetPlug is an extensible multi-connections, multi-protocol, network client program, written in pure Tcl/Tk. Includes a complete Irc client plug in that you should love if you like IrcII 'classic' look & feel (plus customizable style/colors scheme, sound,... Now includes full DCC support (with GUI), ircII like aliases and improved scripting (Tcl!), keywords (your nick...) highlighting, and more
vTemplate is a PHP class that is intended to make splitting PHP from HTML a simple and natural task. It has easily understandable syntax that is much easier to use than other template classes. It compiles a template into native PHP code using one PCRE call, thus the parsing is extremely fast. It also has powerful caching and debugging classes to extend the functionality.
ajax-cross-browser-using-iframes uses Iframes, an empty div, and innerHTML, allowing you to create AJAX calls. It is a little bit confusing at first, but once you understand it and place the necessary nested PHP files, it will allow you to create unimaginable things. It is cross-browser.
Embperl gives you the power to embed Perl code in your HTML or XML/XSLT documents and the ability to build your Web site out of small reusable objects in an OO-style. It can also build taglibs and use caching. You can also take advantage of hundreds of Perl modules which have already been written for such tasks as database access to a growing number of database systems. Embperl has several features especially useful for creating HTML, including dynamic tables, formfield-processing, escaping/unescaping, session handling, and more. Embperl is a server-side tool, which means that it's browser-independent. It can run in various ways: under mod_perl, as a CGI script, or offline.
Class::Date provides a date datatype for Perl. You can create new Class::Date objects with a constructor from different scalar formats, array refs, and hash refs, and then you can easily manipulate it by the builtin "+" and "-" operators (e.g., $date=date([2001,03,15])+'3Y 1s'). Relative date types also available.