What tools do you use to create an SPF record?

What tools do you use to create an SPF record?
There are several sites out there that allow you to go through a wizard and will give you an SPF string you would add to your DNS record. Below is a sites that has  a wizards for creating a record:

  1. Microsoft - http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/

There are also several sites that you can use to test your SPF records.

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