There are no official applications online for Snapchat, but there are a number of sources that allows users to access it. An application called "Bluestacks," which is available for Windows and OSX, is an Android app emulator that allows users to easily download and run the mobile app.
Using Bluestacks is a matter of downloading it to a desktop and running the application. Once the application is running, users can search for the Snapchat app as they would on a mobile phone and download the app. Once the Snapchat app is downloaded, users have the option of entering a current Snapchat account or creating a new Snapchat account directly from a desktop.