Ity.im is a URL shortener that claims to be "the most powerful." For one, using Ity.im can make you money by displaying interstitial and frame ads when a short URL is used. The Ity.im API provides access to shortening and expanding functions from within your application.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.