Sachin Khosla

This plugin will allow you to remove the URL option from the comment box. This prevents automated bots to post spam links on your website. It helps your website retain the SEO Juice. 
This is a lightweight very simple plugin. No Javascript, ajax hack.
<h3>Usage</h3>
Simply activate the plugin and the URL input text box will not appear.

Disable / Hide Comment URL

Disable/Hide Comment URL lets you hide the URL/Website input field from the WordPress inbuilt comments block.

Link

使用短代码 <code>[wp-openlink]</code> 将链接输出到一个页面，带网站缩略图（备注字段）和点击数（评分字段），不修改数据库也不需要专门存储图片。
缩略图格式说明：长宽为 100px * 70px，保存格式为 Data URI 编码，读写实时，每张占用数据库大小约为 10k。
<ol>
<li>可配置缩略图接口</li>
<li>可自定义链接样式</li>
</ol>
More information: <a href="https://www.xiaomac.com/open-link.html" rel="nofollow ugc">www.xiaomac.com</a>.

Open Link 图链

Use [wp-openlink] to output all your Blogroll in a Page, with website screenshot thumbnail and clicks countable, no database altered or images storage …

Disable / Hide Comment URL vs Open Link 图链