You can find out the theme and plugin of any wordpress site or the theme of a blogger website using online tools or checking the source code of that particular websites. To know the theme and plugin a wordpress is using, Just visit any of these two website www.wpthemedetector.com or www.whatwpthemeisthat.com, enter the website/blog url in the address bar and click.
This is a blog about blogger template, blogger widget, blogging tips, news, fashion etc.