You can talk about life, the universe and everything here: nothing's off topic.

Establish abbreviations, words or phrases that will be underlined and defined in the text of your website pages.

A full-featured calendar module for ExpressionEngine.

CrawlTrack allows you to keep track of search engines that crawl your website.

Allows your users to vote on your weblog entries Digg-style.

Adds Facebook single sign-on capability to your EE site, as well as the ability to publish data from EE to ones Facebook profile.

Enables your members to save and remove Weblog Entries as Favorites.

Simplified and customizable file upload capability in stand-alone entry forms.

Create flexible forms to receive input and attachments from your customers, clients, members, &c.

Allows your users to create and manage lists of friends, along with complete private messaging, status updates, referral tracking, and virtual groups.

Treat images on your site like putty and slap them onto any type of EE content.

Allows you to import data from Excel or XML sources into your weblogs.

Collects, tallies and displays ratings and reviews.

Simplifies and adds power to the relating of entries, as well as the ability to add multiple entries.

Allows you to create and edit short URL's on your own domain.

Optional enhancements to the EE CP and adds a Toolbar on the front end of your site.

Greatly improves the performance of your average EE search or blog page.

Allows you to cache an entire page in ExpressionEngine based on its URI.

Tag your weblog entries with keywords. Create tag clouds. Show entries by a shared tag.

Provides a set of tabs below templates in the template edit page in ExpressionEngine's control panel for an enhanced template management experience.

Greatly improve page performance by pre-processing parts of your templates that will change less often than every few seconds.

Increase traffic and page views by highlighting what's popular on your site

Brings EE member template functionality outside of those restricted templates, and brings with it a robust set of front end member management tools.

Allows you and your users to submit YouTube-type videos to your website or entries.

Grab images from your Flickr account and throw them on a page using standard EE variables.

Rig up your SAEF's to function as high-end, customizable, web service applications.

Dynamically select the states of form elements and CSS objects at page load time.

Allows the user to simulate repeating events.

Allows your users to upload/attach files or images to EE comments.

Send member registration info to your Constant Contact email marketing account.

Allows you to display weblog entries based on a custom date field timeframe.

Allows you to send customized notifications of newly submitted and/or updated weblog entries to admins and authors.

Prevent spam submissions to Freeform.

Preparse allows you to parse EE template data when publishing/editing a weblog entry.

Allows you to assign a primary category to an entry using AJAX drag and drop, and pull the primary category variables like all native EE category variables.

Add an onSubmit Javascript handler to any EE form.

Append an entry id to the "return" parameter of an SAEF form. Control the results of form submission.

A collection of PHP and JavaScript classes and functions that will standarize and improve your building of Add-Ons for ExpressionEngine.