Simple Signup Form – jQuery Plugin
Pantherius
Build responsive sign up form with email notification. Provides Visual Builder and lot of customization options.
Facebook Login/Like/Share Plugin
Grizzly New Technologies GmbH
jQuery Facebook Plugin enables websites to offer an full ajax based authentication and login/registration process based on the Facebook JavaScript SDK. Beside that, the plugin offers functionality for adding Like buttons and other social widgets to websites easily.
Christian Vuerings
Show a stream of your online activity with jQuery
prettySocial – custom social share buttons.
Sonny T.
Custom share buttons for Pinterest, Twitter, Facebook and Google Plus.
GUAW: A GitHub User Activity Widget
Ethan Zimmerman
A jQuery plugin for displaying GitHub user activity in a handsome little widget.
Ayat.js – Quranic Verses Plugin
Kamal Jellouli
Generate Quranic Verses by Topics, Languages, Reciters and other Options