While not technically a cable, the Neet sleeve gets a place in this roundup because it can make any cable a little smarter.
Kind of like a knitted sweater for your cables, the Neet Cable Keeper is a fabric sleeve with a shapeable wire embedded in it. The sleeve zips open completely and lets you lay your charging cable (or earphones) inside. Once zipped back up, the sleeve not only protects your cable, it keeps it from getting tangled. Also, because of the wire that's hidden beneath the fabric, you can shape the cable to double as a stand for your smartphone.
The sleeves come in 3-foot lengths and a variety of colors that can help with identifying your cords.