SwapChat is an unofficial Snapchat client for our Windows Phone. There's already a paid version of SwapChat and now we can add a free version to the mix.
The free version is ad-supported and has most of the features the paid version has. You can take pictures, add captions, set a viewing time and send it to your friends. You also can view your friend's photos and see when they open your messages.
If you're not familiar with Snapchat it is a service that enables users on multiple platforms (iOS, Android and Windows Phone) to share photos in a rather addictive way. It essentially enables one to set how long images that are sent to other mobile phones will be available and displayed. Photos are only viewable for a set amount of time.
The free version will get updates but only after the paid version. SwapChat free is available for both Windows Phone 7.x and 8 devices. You can find SwapChat Free here in the Windows Phone Store.