You can sell items on Craigslist, just like classified ads in newspapers, for free — you don't even need a Craigslist account.

You can search through all of Craigslist at once with the help of several third-party sites and apps.

Craigslist, the internet's dominant source of online classified ads, made news in June when it sent a cease-and-desist letter to PadMapper — a popular apartment-finding service that combines ...