PagerDuty - Cloud based monitoring service
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
VictorOps - We make on-call suck less & help teams to solve problems faster.
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
xMatters - xMatters transforms event data into intelligent communication IT teams, avoiding outages and disruptions
Quest - Quest lets you create sophisticated text-based games, without having to program.