Zabbix - Track, record, alert and visualize performance and availability of IT resources
Stockpile - Stockpile is a free online inventory system for small business and at home uses.
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.
inFlow Inventory - inFlow Inventory is inventory management software for small businesses.
Prometheus - An open-source systems monitoring and alerting toolkit.
mobe3 WMS - mobe3 WMS is a cloud-based warehouse management system that allows you to automate your warehouse inventory.