Check out my quality WordPress plugins:
Shows contextually related products from your OpenCart powered web store in your WordPress blog. Add a WordPress blog to your OpenCart store and use it to increase sales. A WordPress blog with fresh content can give your OpenCart store a big boost in the search engines. With this plugin your WordPress blog will also promote products from your online store.
Fast domain name lookups and support for over 4 dozen Top Level Domain names make this a killer plugin for any WordPress powered site. The appearance of the Ajax whois form can be fully customized and you can even add a domain registration link allowing you to sell domain registration services using this plugin.
Add a post or page specific message or content to your WordPress sidebar using this plugin. The message can be intuitively entered on a post or page edit screen and will only appear on the sidebar for that specific post or page. The plugin also comes with numerous icons that you can add to your message to make it more eye catching.
Animated Feed Icon is a free WordPress Plugin that lets you add an animated RSS feed icon to your WordPress powered website. The plugin creates a widget that you can simply drag and drop to any sidebar on your WordPress site. It comes with animated feed icons in a number of different colours that you can choose from.
Hashcash for Contact Form 7 is a free plugin that protects your contact forms from spam with a captcha-less anti-spam solution. The main advantage of using Hashcash for Contact Form 7 is that it protects your contact from spam bots without inconveniencing human beings who want to reach you.
Bitcoin transactions are all public so reusing bitcoin addresses is bad for your privacy. Bitcoin Address is a WordPress plugin that helps mitigate that problem by handing out a different address each time someone requests one.