PagerDuty - Cloud based monitoring service
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
VictorOps - We make on-call suck less & help teams to solve problems faster.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
xMatters - xMatters transforms event data into intelligent communication IT teams, avoiding outages and disruptions
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.