WordPress.org

The most popular WordPress gallery plugin and one of the most popular plugins of all time with over 16 million downloads.

By: photocrati and imagely.

Supercharge your WordPress theme with mega pack of shortcodes

By: MadFork and Vladimir Anokhin.

Responsive Lightbox allows users to view larger versions of images and galleries in a lightbox (overlay) effect optimized for mobile devices.

By: dFactory.

SEO Friendly Images automatically adds alt and title attributes to all your images improving traffic from search engines.

By: Vladimir Prelovac.

Alles-in-één Favicon management. Voeg eenvoudig een Favicon toe aan je site en de WordPress admin pagina's. Compleet met upload functionaliteit. Ondersteunt alle drie de Favicon typen (ico,png,gif)

By: techotronic.

Automatically publishes blogposts to profiles/pages/groups on Facebook, Twitter, Instagram, Google+, Pinterest, LinkedIn, Blogger, Tumblr ... 22 more

By: NextScripts.

Make your website look beautiful and crisp on modern displays by creating and displaying retina images. WP 4.4+ is also supported and enhanced.

By: Jordy Meow.

The highly customizable lightbox for WordPress

By: Archetyped.

Take complete control over the WordPress content editor.

By: Josh.

Automatically generate the Post Thumbnail (Featured Thumbnail) from the first image in post or any custom post type only if Post Thumbnail is not set

By: tariquesani.

Integrate a fancy slideshow in just five steps. - Rainbows. Rainbows everywhere.

By: Stefan Boonstra.

Description: Beef up the WordPress TinyMCE content editor with a plethora of advanced options.

By: Josh and Marventus.

Seamlessly integrates FancyBox lightbox into your WordPress blog: Upload, activate, and you're done. Additional configuration optional.

By: Silkalns.

A better management for WordPress Media Library

By: webbistro.

Maak je website sneller. Optimaliseer alle JPEG en PNG afbeeldingen automatisch met TinyPNG.

By: TinyPNG.

Lazy load images to improve page load times and server bandwidth. Images are loaded only when visible to the user.

By: Mohammad Jangda, Automattic, Jake Goldman, and 10up.

A responsive image lightbox for WordPress galleries & Foo Gallery

By: bradvin, fooplugins, and Freemius.

Instagram Slider Widget is a responsive slider widget that shows 12 latest images from a public instagram user or up to 18 images from a hashtag.

By: JR Web Studio.

Very easy to use WordPress lightbox plugin to display YouTube and Vimeo videos in an elegant lightbox overlay.

By: Tips and Tricks HQ, Ruhul Amin, and wptipsntricks.

De Lightbox Galerij plugin verandert de weergave van galerijen naar lightbox.

By: Hiroaki Miyashita.

Adds Colorbox/Lightbox functionality to images, grouped by post or page. Works for WordPress and NextGEN galleries. Comes with different themes.

By: techotronic.

An easy-to-use image script for adding things such as thumbnail, slider, gallery, and feature images.

By: Justin Tadlock.

List of your site’s most recent posts, with clickable title and thumbnails.

By: Martin Stehle.

Lazy loading for images and iframes makes your site load faster and saves bandwidth. Uses no external JS libraries and degrades gracefully for non-js

By: Bjørn Johansen and arontornberg.

Dramatically reduce image file sizes without losing quality, make your website load faster, boost your SEO and save money on your bandwidth.

By: WP Media.

Custom feeds for Facebook Pages, Groups, Events, Album Photos, Videos & Covers, Twitter, Vine, Instagram, Pinterest & YouTube on pages, posts

By: slickremix.

Feature content in a JavaScript powered slideshow gallery showcase on your WordPress website

By: Tribulant Software.

Allows a user to associate a photo with their account and for this photo to be displayed in their posts and comments.

By: Weston Ruter, Ryan Hellyer, and Glen Scott.

Simple, stylish, and compact plugin for displaying Instagram photos in a sidebar, post, or page.

By: theAlpinePress.

The Image Sitemap plugin will generate an XML Sitemap for Images that exist in your WordPress blog.

By: Amit Agarwal.