Really Simple Gallery Widget for WordPress

Really Simple Gallery Widget adds a widget to display images from the Media Library, no extra uploading or creating custom post types required. You can choose to show images from a specific post/page, the entire media library, or a specific set of attachment IDs. On single pages/posts, you can also show only images attached to the item currently being viewed. Especially helpful if your galleries are based on what’s attached to a post and you want to be able to easily display those images in a widget area.

Features

Add as many widgets as you want, wherever you want

Display images from a specific post/page, the entire Media Library, or a specific set of attachment IDs

Display images from the post/page currently being viewed

Select a number of images

Select any registered size in WordPress

Display the images in various orders

Show or hide captions

Link the images to the original file, post, anchor in the post, attachment page, or nothing. NOTE: If the image is not attached to a post, the file link will be used instead of the post or anchor in the post.

Add a prefix to the link and image title (appears as a tooltip)

Use a rel attribute for the link – great for lightboxes