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OpenSocial Orkut opened an Orkut SandBox for developers to test the OpenSocial APIs and widgets. Developers who have signed up for the Orkut SandBox will have access to social apps and can test out Orkut widgets and gadgets. Here is what you need to do to get the OpenSocial apps on Orkut.

1. Sign up and request access to the OpenSocial Orkut Sandbox (even if you are a developer or not)
2. Open Orkut and navigate to sandbox.orkut.com
3. Browse the Orkut applications directory and choose applications to test.

 Note: Unless you are accepted to the Orkut Sandbox, you probably won’t be able to test applications on Orkut so make sure you request access as soon as possible.

Remember that you will have to reload every applications each time you login to Orkut . Orkut Sandbox has got a good set of cool new little Orkut applications.
Orkut also gives you the ability to add 3rd party applications by entering the URL to their .XML file.