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Multipoint as recommended is your most appropriate option
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Multipoint as recommended is your most appropriate option

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Would there be any kind of OpenSource/Free Software that works in a similar way? I thought that I could leverage ProxMox, but the logistics are tying my head in a pretzel.
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Would there be any kind of OpenSource/Free Software that works in a similar way? I thought that I could leverage ProxMox, but the logistics are tying my head in a pretzel.

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Although I haven't installed/configured it personally, I've seen automseat (<a href="http://automseat.sourceforge.net/" rel="ugc">http://automseat.sourceforge.net/</a>) in use and it worked well.
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Although I haven't installed/configured it personally, I've seen automseat (http://automseat.sourceforge.net/ [http://automseat.sourceforge.net/]) in use and it worked well.

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We are looking into both automseat and Windows Multipoint server as we speak. We'll let you know how it all works out soon.
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We are looking into both automseat and Windows Multipoint server as we speak. We'll let you know how it all works out soon.

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This worked out perfectly, thanks for the recommendation!
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This worked out perfectly, thanks for the recommendation!

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We want to use one desktop with, say, 4 keyboards, 4 video cards, and 4 mice as a thin client user station so that 4 users could use the same desktop at the same time, each with their own instance. What are our options? They don't need to be powerful; just running one light-weight application.
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We want to use one desktop with, say, 4 keyboards, 4 video cards, and 4 mice as a thin client user station so that 4 users could use the same desktop at the same time, each with their own instance. What are our options? They don't need to be powerful; just running one light-weight application.

Multiple users on a single computer

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.