The mod is called VM Computers, made by DeltaTwoForce, who posted it over in r/gaming a couple days ago (that's where the gif is from). It uses VirtualBox, so you'll need to download and install ...

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Instead, these mod packs are really good - you just download them and it's one click and you get all these mods. It's quite a process to set all that up manually. It's an easy way to get an audience.