Sohan Zaman

When you just want to manage the post thumbnail or featured images, you don’t have that on quick edit option. You have to go to the edit page, change featured image, save and then go to another post edit page and repeat the process.
Now with this plugin, you can do that directly from your “All Posts” page. When you activate the plugin, a new column called thumbnail is added there. From there, you can add, change or remove featured images of your post.

Easy Thumbnail Switcher

অসাধারণ

A simple plugin which adds ability to add/modify/remove featured image just from "All Posts" page on your dashboard.

Carey Zhou

Handles uploading, modifying images on Flickr, and insertion into posts.
上传和编辑 Flickr 账户中的图片，并且在博文中插入Flickr账户中的图片，利用Flickr做图床。
Inserting images into posts could never have been easier. Simply click on an image from the added ‘Flickr Manager’ panel on the edit page and it will automatically be inserted into your post.
本插件由 “WordPress Flickr Manager” 更新而来.

WPFlickr

Handles uploading, modifying images on Flickr, and insertion into posts.

Easy Thumbnail Switcher vs WPFlickr