Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Quest - Quest lets you create sophisticated text-based games, without having to program.
Zabbix - Track, record, alert and visualize performance and availability of IT resources