360crest

Nerd social share button is a set of very simple and light weight social buttons, it doesnt use javascript not images, all it uses is font, and just has no load weight to your website/blog like other share buttons does.
There’s an option to show the buttons on posts and pages. You can also put the buttons anywhere in your template using this template tag:
<pre><code><?php nerd_social_share_tag(); ?> </code></pre>
You can also display using this shortcode in single posts and pages:
<pre><code>[nerd-social] </code></pre>
Please note that these buttons do not show share counts. The essence of the whole thing is to keep it very simplified.
The only button that requires a little snippet of JS to work is the Pinterest button but this does not slow down your site in anyway. A demo of the plugin can be seen here: http://shoutershub.com/

nerd Simple Share Buttons

Simple Social Share buttons, no Javascript, no image, just css and fonts

Relentless Apps

RRSSB stands for ridiculously responsive social share buttons and is an adaptation of Kurt Noble’s library for web. Install the plugin and use the exposed function or shortcode to display social sharing buttons on your site.
rrssb(options);
Function options can be a string (comma separated for multiple values) 
or an array of strings
[rrssb options=””]
Shortcode options can be a string (comma separated for multiple values)

RRSSB

Create social sharing buttons using the ridiculously responsive social sharing buttons script.

nerd Simple Share Buttons vs RRSSB