Platform: Unix (Linux, Solaris, FreeBSD), Windows, Mac OS X, Symbian, iPhoneOS

Architectures/Models: Zend, J2EE / Enterprise Java Beans (EJB), .NET, Web Services (SOAP)

Java-Technologies: Java Server Faces, Spring, Hibernate

Application Server: Apache/Tomcat, JBoss, Hudson, Resin

Client-side Technologies: HTML, AJAX (JavaScript/jQuery), Actionscript/Flash

Programming Languages: PHP, Ruby, Perl, Java, C++, Shell, as well as database-idioms , e.g. MySQL, MSSQL, PostgreSQL u.a.)

Database Management Systems: MySQL, Oracle, SQL Server, Access, SQLite

Software Concept: Entity/Relationship, Rapid Development, Prototyping

Data definition language: XML/XSL/XSLT

Content Management Systems: Drupal, Wordpress, Typo3

Deployment tools/development process support: CruiseControl, Maven/Ant, Phing, PHPUnit, JUnit

Integration of opensource solutions: SugarCRM, Alfresco, OTRS, PHProject, OpenOffice, Mozilla