 Typically, a third-party developer will develop and create an application that will use a web service from the sandbox, which is used to allow a third-party team to validate their code before migrating it to the production environment.Microsoft,
Google, Amazon.com,
Salesforce.com,
PayPal,
eBay and 
Yahoo, among others, provide such services.Wikis also typically employ a shared sandbox model of testing, though it is intended principally for learning and outright experimentation with features rather than for testing of alterations to existing content (the wiki analog of source code).