Below followes a list, in no specific order, of sites I find interesting, useful or enjoyable enough to list here.

Excel translator
Functions in Excelformulae have different names in different languages. This can make it rather difficult to write a formula in an Excelinstallation on a computer with a different language than the one in which you know the name of the functions. Sometimes you can guess, but other times they are completely different than what you may expect. This website translates the formulae for you.
(Website was added to this list on: mch-8-2025)

Terms of Service Didn't Read
A summary of the terms and conditions for online services.
(Website was added to this list on: Sep-1-2024)

Hedy
Using Hedy you can teach yourself how to write software. The main purpose of Hedy is for classroom use, but you can use it by yourself too.
(Website was added to this list on: Sep-1-2024)

Doxygen
Doxygen is a tool which generates documentation and simplifies documenting sourcecode.
(Website was added to this list on: Sep-1-2024)

John Wolff's Web Museum
A virtual museum of mechanical calculators and music boxes.
(Website was added to this list on: Sep-1-2024)

XKCD
XKCD is a webcomic by Randall Munroe. Described by himself as "A webcomic of romance, sarcasm, math, and language.".
(Website was added to this list on: Sep-1-2024)

Green software foundatation
The green software foundation has interesting information about how we can produce more sustainable software, for now the focus is mainly on websites and datacenters, not on embedded software.
(Website was added to this list on: Sep-1-2024)