Open Source Social Sharing Widget – shareNice
shareNice is an open source social sharing widget -similar to AddThis or ShareThis- for adding sharing features to any website easily.
It focuses on the privacy of users, doesn't place any cookies or share any information with 3rd party services.
There is built-in support for most of the popular social websites (Twitter, Facebook, Delicious, etc.) and, considering the source is available, new ones can be added (or removed).
It is possible to customize the services to be displayed, color-scheme, icon sizes and the label ("share" by default).
P.S. shareNice is also available as a free-to-use service.