The Grabicon API will generate a favicon from any site. If the site does not appear to have a favicon, the API will create a suitable default for you. Grabicon will also ensure that all favicons appear at a consistent size, no matter what size they were originally displayed as. This API is free and the documentation includes several code examples for use.
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.