Native / C2: English
Upper-intermediate / C1: Spanish / Español
Beginner / A1-A2: Portuguese / Português
Less than beginner / -A1: French / Français, German / Deutsch, Swahili / Kiswahili, Auslan - Australian Sign Language
Mobitex / MASC / MPAK / MDOT, DataTAC, SMS / GSM 03.40, SS7, Nokia Smart Messaging, IP, UDP, TCP, SMPP, IPsec / IKE, IMAP4rev1, POP3, SMTP, HTTP, WAP, FTP, LDAP, SSH, SSL / TLS and others.
Mac OS since circa System 3.0, Linux (since kernel version 2.0.x) RedHat / RHEL / CentOS, Mandrake, e-smith, Yellow Dog, LinuxPPC, Debian (my preferred distribution), Ubuntu, Knoppix, Palm OS 3.5.x / 4.x, MS Windows since 3.x, MS-DOS 6.x / 7.0, ULTRIX, Digital Unix / OSF, HP-UX, SunOS / Solaris, BSD/OS, OpenBSD since 2.x, FreeBSD since 4.x.
ANSI C, ANSI / ISO C++, Perl, Python, shell / Bash, SQL, Ruby, Go, Java, Groovy, HTML / SGML / XML / XSLT, JSON. YAML, WML, CSS, PHP, Tcl / Expect, R, Lisp, MIPS Assembly, Pascal / Delphi, PowerShell, Visual Basic, Javascript / ECMAScript, etc.
Git, Mercurial, Subversion, Jira, Trac, Bugzilla, Mantis, CVS (WinCvs / CvsGui, etc.), make, autoconf, automake, AutoGen, GCC, GDB, DDD, Valgrind, PilRC, PRC-Tools, POSE, Microsoft Visual Studio, Watir, Selenium Mountebank, Node.js, and others.
strace / truss, tcpdump, traceroute, ping, nc (netcat), ip, route, rsync, ssh, daemontools, AutoRPM, apt, dpkg and many other standard tools of the trade.
VMware, MySQL, PostgreSQL, Informix, Oracle Database, MongoDB, Apache HTTP server, Tomcat / JServ, JBoss, BEA / Oracle WebLogic, IBM WebSphere, Linux Virtual Server, qmail, Postfix, Sendmail, ProFTPD, vsftpd, OpenLDAP, Courier, Cyrus, and others.
Object-oriented programming, regular expressions, distributed systems, TCP/IP networking, Extreme Programming / Agile methodologies, operating systems and computer architecture, Ethernet, computer security, database management, queueing theory and more.