Google Plus Share and +1 Button
This plugin puts a google+ share button on top of posts.
Plugin Tag: google plus button
Google+ Author Button
This plugin adds a 'Add [author_name] on Google+' button to the end of every post.
Ligurian (Genoese)
This plugin puts a google+ share button on top of posts.
This plugin adds a 'Add [author_name] on Google+' button to the end of every post.