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GLPI
GLPI is a Free Asset and IT Management Software package, Data center management, ITIL Service Desk, licenses tracking and software auditing.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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osTicket
The osTicket open source ticketing system official project repository, for versions 1.8 and later
I'd recommend GLPI, a French open source ticket (and more) managing system. It has a lot of great plugins - including a powerful form creator.
Also, inventory management, I don't have great advice on this as we are just trying to implement https://snipeitapp.com/ in our environment, but if you use tickets to Assign laptops and serial numbers you can keep track of what equipment is sent to people. My boss only cares about stuff that is plugged into the wall and is over 100$ dollars, so it can be recovered when people leave the company.