open source?
icinga, nagios, cacti, asterisk, kamailio, yate, RTP proxy, RTP engine, homer,
captureagent, pacemaker, jenkins, ansible, DRBD, nginx, ganeti, qemu / KVM,
net-snmp, quagga, puppet, tshark, postfix, squid, vim, sox, linux kernel, apache,
firefox, gnome, KDE, freeradius, bind, percona, open LDAP, HA proxy, pound,
lighthttpd, bacula, php, python, gcc, cups, perl, openjdk, exim, foreman, git,
ecplipse, stun, libre office, imagemagick, lame, mpg123, ruby, redis, memcache,
beaver, casperjs, pahntomjs, mongoDB, note.JS, openAFS, openSSH,
openVPN, openSSL, samba, syslog-ng, vs-ftpd, spandsp, wireshark, bootstrap,
jquery, requireJS, wildfly, elasicsearch, logstash, kibana, iTerm, atom, meteor,
virtualBox, vlc, calibre, keepass, observium, as-stats, ntop-ng, osmocomBB,
osmoBTS, BIRD
etc...