udefn is a SMS service which lets you define keywords or shortcuts to your favorite bots. It turns your phone into a remote control. Just text your command. Customize your profile to read the latest news, see RSS updates, or even trigger your backup. provides a set of APIs that allow external applications to send and receive SMS text messages to and from their users, respectively.
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.