Crawlable Facebook Comments retrieves Facebook comments (with authors, dates and replies) and makes them visible in your source code.
HTML5 Video Shortcode allows you to quickly and easily add HTML5 Video tags as a shortcode.
TentBlogger RSS Reminder is a simple way of capturing commenters and calling them to subscribe to your feed.
Fast Secure Contact Form lets your visitors send you a quick e-mail message and blocks all common spammer tactics. Additionally, the plugin has a multi-form feature, optional extra fields, and an option to redirect visitors to any URL after the message is sent.
SI CAPTCHA Anti-Spam adds CAPTCHA anti-spam methods to WordPress forms for comments, registration, lost password, login, or all. In order to post comments or register, users will have to type in the code shown on the image.