- Operation systems: Linux, BSD, MS Windows, Novell NetWare, Unix;
- Web servers: Apache, IIS;
- Database servers: MySQL, MS SQL, PostgreSQL;
- File servers: Samba, NFS, NCP, proftpd, vsftpd, wu-ftpd, pure-ftpd, sftp/scp;
- Mail servers: Postfix, MS Exchange, Mail Daemon, Sendmail, Cyrus, Courier, Qpopper, Cucipop, Popa3d, Procmail;
- Proxies: Squid, Pound;
- Virtualization: Xen, VirtualBox, VMWare, FreeVPS;
- Antivirus software: F-Secure, ClamAV, Symantec/Norton Antivirus, Kaspersky Anti-Virus, Dr. Web, NOD;
- IDEs: Borland C++, MS Visual C++;
- Languages: C/C++, Perl, PHP, Bash, SQL, HTML, XML/XSL;