Quoting from JumpBox official announcement:

JumpBox, a new virtual appliance development service, announced today that it has joined the VMware Technology Alliance Partner Program. JumpBox virtual appliances are a way to simplify and speed up the deployment of server-based software both for the software vendor as well as the consumer...

At the moment JumpBox just offers a beta virtual appliance called vTiger, a customer relationship management solution, available for VMware, Xen and Parallels virtualization platforms.