Links

The point of the world wide web is for websites to link to other websites after all

General utility

• random.org is an online random number generator with a lot of handy randomizing features.
• PicResize.com is what I use when I don't feel like opening GIMP just to resize a picture.
• WolframAlpha is pretty useful when you have an equation you don't want to work out. It can also deal with different units and even substitute the appropriate values for "Earth diameter" if you can't be bothered to look it up yourself.

Information

These are mainly databases of things

• Discogs about music releases and discographies
• alldatasheet.com datasheets of semiconductor devices
• elektrotanya manuals and schematics for old consumer electronics
• hifiengine and vinylengine specs and manuals for hifi
  Unfortunately, registering new accounts has been disabled for some time on both and existing accounts are deleted without notice (who does that!?), so getting hold of manuals hosted there is difficult these days

Forums I frequent

• Tapeheads.Net a classic forum dedicated to magnetic tape recorders and any other hifi stuff
• New XKCD forums a revival of the old XKCD forums, which was one of my favonline communities until it went offline following a breach (and yes, that is a dead link).

Misc

• Eternal Jukebox makes any song go on indefinitely by finding places it can jump ahead or loop back seamlessly. Unfortunately the site on that link doesn't seem to work, but there are some mirrors here and here. If you use Ublock (and you should), you might need to turn it off for this.