Base Languages (for modules and components development)
C/C++ :
Unix: gcc, GTK+
Windows: Visual C++ 6.0, Borland C++ 5.0
Visual Tools: Borland C++ Builder 5.0, Object Pascal (Delphi), Basic (Visual Basic, ASP)
Java (AWT и Swing)

Client-development languages
Object Pascal (Delphi 4/5/6), Visual Basic, Visual C++, Java (Swing)

Web-server scripts
PHP
Perl 5.xx (Linux/FreeBSD)
ASP (VBScript, Javascript)
JAVA (JSP, Serverside Javascript for IIS) and Applets/Servlets technologies (Unix/Linux NT/2000)
Java Script, Vbscript (client side)
ColdFusion

Mobile platform
iPAQ: Windows CE, Microsoft eMbedded Visual Tools 3.0, 4.0

Markup Languages
HTML/DHTML, XML(XLST,XML Schema, DTD)

Modelling systems of software development
UML (Rational Rose, Dia), Microsoft Visio, ErWin, PowerDesigner

Special libraries for server-side generation of output documents
Gdlib, pdf-lib, png-lib

Each of languages mentioned has been used at least in one project (except Cold Fusion)

Databases
Oracle 9i, 8I MS SQL Server 7, SQL Server 2000 MS Access PostgreSQL 7.x MySQL 3.23.x Interbase

SQL dialects
Ansi SQL, T-SQL, PL/SQL

Each of databases mentioned has been used at least in one project (except Oracle 9i)