Wolfram Alpha is impressive. It can do math (and graphing, and statistical calculations, and solve knotty problems), analyze socioeconomic trends, play Hangman, create historical timelines, and even be snarky.
More importantly, it can also answer pressing questions about nutrition.
A few music and making-music links to start off the weekend.
Water Music, generated using Perlin noise
Boodler, a soundscape tool in Python
sfxr, a utility to generate random retro-styled sound effects for video games
Video game music remixes
Remix an Information Society song or two
Or remix a NIN song
100 songs under a Creative Commons Attribution license (some of them [...]