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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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simplewall
Discontinued Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
I recommend getting yourself a Education or Enterprise version of a Windows install and following this hardening list and at the very list going for everything that's ticked. When it comes to privacy open Group Policy, go here, and set the setting to security.
Plus a pihole on your network to keep the damn operating system from chatting your every click back to Microsoft. https://nextdns.io/ can replace the pihole if you wish, but it's easy to go over the free tier and costs money if you do. It's not a ton of money though and the service is solid.
Look here: https://lutris.net/
That said, if you're running DOS games, I'd normally recommend DOSBox.
I recommend you to first debloat windows 10 and then use a firewall like simplewall - https://github.com/henrypp/simplewall to disable windows from using the internet. (This will not let windows update though)