Andy's Lofi Gaming

A nice little site targeting "old-tech and low-spec games and machines" such as 8-bit game consoles, Game Boys, etc. Has indespensible ROM files for system BIOS, etc. (No game ROMs.)

Link

Heritrix Crawler

Heritrix is an open-source archival web-crawler.

"Heritrix (sometimes spelled heretrix, or misspelled or missaid as heratrix / heritix / heretix / heratix) is an archaic word for inheritess. Since our crawler seeks to collect the digital artifacts of our culture for the benefit of future researchers and generations, this name seemed apt."

dead link: http://crawler.archive.org/

Fixed link

Plex86

An opensource x86 on x86 system emulator. This is a "lightweight" emulator designed only to run Linux under Linux.

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VMware

The big name in virtual machines to run Windows, Linux, etc, on i86 hardware. Expensive, but well polished with nice features like revert to snapshot, etc.

Link