Widget tag > links
The submitted widget will be displayed with the tag [links].
Broken Link Check Tool
Just enter a URL and this tool displays the broken links. Although the display page is in Japanese, only broken links are listed, so anyone can use this tool. Code is right on the widget's webpage.
Social Bookmarking Button
Displays icons for a whole bunch of English language and Japanese popular bookmarking sites. The icons are links to that site. Put this widget on your blog to increase your SEO. Code is easy to find on the widget's website.