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.
Snipe-IT - Managing assets with a Google doc or a shared Excel spreadsheet is more common than you think.
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.
inFlow Inventory - inFlow Inventory is inventory management software for small businesses.
Zabbix - Track, record, alert and visualize performance and availability of IT resources