I feel like Cohost would very much enjoy this website I stumbled upon through a Wikipedia reference: RogCAD. RogCAD is a freeware piece of keyboard-entry based CAD software. There's also a specialty version called RogCAD Virtual Girder & Panels Set, a version meant to let you emulate the 1960s Kenner Girder & Panel building toys (a set of which I inherited from my dad as a kid, and then later googled about, leading me to this website via the Wikipedia page for that toy)
In addition to the main page, which features an array of 3D models including a recreation of the Crystal Palace, the sitemap also includes links to a page on the Hermit Thrush, homemade dog food recipes, screen capture for DOS, and information about the website owner's dayjob, removal and restoration of exterior paint on historic homes in the Twin Cities.
This isn't an old website either, RogCAD is (apparently) still receiving updates, and the owner still actively doing paint projects in the Twin Cities. The homepage was last updated earlier this month.
Not quite a time capsule, because it is being updated, but it's a fun thing to stumble upon.
Oh yeah, the owner also has done some writing about relativity. I know even less about relativity than I do text-based 3D modeling, so I can't comment much on it.