This is an excellent array of methods to keep your cables organised.

Taming Gadget Cables: 30 Holders & Organizers You Can Buy.

You can buy most of them at The Container Store

Twisty cable IDs / Helix

Q Knot

Cable Zipper

Cable tie kit

Velcro cable ties

Unfortunately this shop doesn’t work in Firefox and won’t ship outside the US / Canada.