[haasted]

This is true, but the unfortunate angle on that is that, with the exception of Varnish, none of those things were actually made IN Denmark, if I recall correctly.

Update: Seems DHH started RoR while studying at CBS.

[flexd]

Varnish was started in Norway as far as I know. Not that it's that relevant to know exactly where it was started. :)

[doppel]

The lead developer, Poul Henning-Kamp, is a danish national but was hired by a norweigan newspaper to develop Varnish.

[jlouis]

The initial funding came from Norway, but the code was written partially in Norway and Denmark IIRC. Perhaps mostly Denmark.

[peteri]

Turbo Pascal was definitely Danish (polydata)