User Submitted Posts enables your visitors to submit posts and images from anywhere on your site via template tag or shortcode. User-submitted posts optionally include tags, categories, post titles, and more. You can set submitted posts as draft, publish immediately, or after some number of approved posts. Also enables users to upload multiple images when submitting a post. Everything super-easy to customize via Admin Settings page.

All WordPress plugin developers, you can integrate a security captcha image into your own WordPress plugin using the Really Simple Captcha plugin. It is a plugin in itself but it serves as an API and doesn’t have any purpose on its own without other plugins using it.
This is an example of how to use the Really Simple Captcha plugin API with your own WordPress plugin.

Over the past three days we’ve accomplished quite a bit. First we set up a form to post from the front end. Once we had the form all set up, we dropped in some code to allow images to be uploaded with the form. And finally we added in the ability to use custom meta boxes on our form to collect additional information in custom fields for us to use. That’s a lot of code. Plus I had some difficulties with code that sometimes worked and sometimes did not. I got that all fixed. I thought it might be best to drop the full code I have in one post so that we can review it together.

Lets you show Future or Schedule Post on Single Posts. It also enables comments for future posts.

This plugin lets you save your posts, pages, theme and plugin files in the most natural way: pressing Ctrl+S (or Cmd+S on Mac).

WPFunction.Me lets you quickly build all the functionality you need for your next WordPress project!

Compile several SCSS files in a folder structure into a WP-compatible CSS

Customise columns on the administration screens for post(types), pages, media, comments, links and users with an easy to use drag-and-drop interface.

Infinite scroll has been called autopagerize, unpaginate, endless pages. But essentially it is pre-fetching content from a subsequent page and adding it directly to the user’s current page.

This plugin allow you to grab and save the image from remote url into your own wordpress media library.

Video Thumbnails simplifies the process of automatically displaying video thumbnails in your WordPress template.

The web is liberally littered with “What is better WordPress or Drupal” debates (sometimes with Joomla thrown in for good measure). As a long time user of both, I don’t think this is a useful question. But neither is the common answer that they both serve a different purpose. That is true up to a point but I think the real question is not “what” but rather “when”. When it comes down to it, there is nothing that WordPress can do that you could not do in Drupal. But there are many features of Drupal that simply cannot be replicated in WordPress. (Here I’m talking with available modules without significant code.)
There are many ways to compare the two and a web search will reveal many such comparisons. Here I focus on the sort of considerations an individual starting a blog or a small personal site or small institution (such as a school, interest group or a no-budget charity) needing to establish a web presence should take into account.

Query Wrangler provides an intuitive interface for creating complex WP queries as pages or widgets. Based on Drupal Views.

Jigoshop is an eCommerce plugin for WordPress developed by professionals with years of experience delivering online shops for global brands.

An accessible Shopping Cart plugin.

The Best WordPress Ecommerce Plugin

It seems like half the tutorials in the codex and around the blogosphere use query_posts() and half use WP_Query. What's the deal?

This plugin allows you to use unfiltered HTML in your category descriptions by disabling selected WordPress filters.

The Rich Text Tags Plugin allows you to edit tag, category, and taxonomy descriptions using WordPress' built in WYSIWYG editor.

This plugin adds the same functionality of the excerpt feature in posts to pages.