Client-side:
DHTML, CSS, JavaScript, Java Applets, Flash (IE 4-5.5, NN4-6, AOL & Opera compliant)

Server-side:
PHP, JSP/servlets, Perl (CGI), ASP

Languages:
C/C++, Java, Object Pascal (Delphi), Prolog, Lisp, PHP, Perl

Database:
SQL, QBE, ODBC, JDBC

Data formats/ markups:
XML, XSL

Engineering:
UML, OMT

Servers:
Apache, IIS, Tomcat, JBoss/CGI