“You have 25 applications remaining”

How many applications can I create with Google App Engine?

Each account can host 25 free applications and an unlimited number of paid applications Google App Engine. You can delete your existing applications via the Admin Console if you want to create more, but you will not be able to re-register an application ID.

來源：https://developers.google.com/appengine/kb/general
http://appengine.google.com/
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