• OS: MacOS, Linux, Windows, OpenBSD.
  • Programming languages: C, C++, C#, JavaScript(Browser & Server), PHP, Java, shell.
  • Mail Software: exim.
  • WWW: apache, nginx, cherokee, lighttpd.
  • Proxy: squid, 3proxy, sockd, openssh.
  • VPN: OpenVPN, pptpd.
  • DB: MySQL, MSSQL, MongoDB, CouchDB