Automattic

John Godley

Donncha O Caoimh (a11n)

Eoin Gallagher

Lenny

Future upgrades to Sharedaddy plugin will only be available in <a href="http://jetpack.me/" rel="nofollow ugc">Jetpack</a>.
Jetpack connects your blog to the WordPress.com cloud, <a href="http://jetpack.me/support/" rel="nofollow ugc">enabling awesome features</a>.

Sharedaddy

Future upgrades to Sharedaddy plugin will only be available in Jetpack.

Azim Hikmatov

Likely are “the social sharing buttons that aren’t shabby”. Social sharing buttons with two themes, three sizes, ten social networks, any button text and retina support. Supports Facebook, Twitter, LinkedIn, Reddit, Pinterest, Odnoklassniki, VKontakte, WhatsApp, Viber and Telegram. Based on <a href="http://ilyabirman.ru/projects/likely/" rel="nofollow ugc">Likely</a> by <a href="http://ilyabirman.ru/" rel="nofollow ugc">Ilya Birman</a>

Likely

Likely are "the social sharing buttons that aren't shabby". Social sharing buttons with two themes, three sizes, ten social networks, a …

Sharedaddy vs Likely