Do you need a form on your site's front-end where users can upload files? The jQuery Uploadify Plugin makes this simple, and thanks to a user on the Uploadify Forums, extending the capabilities is easy too!
Integrate version 2 of the ReCaptcha anti-spam service into MODX CMS with this Extra.
A quick MODX CMS tip: how to easily make a multi-select Resource list Template Variable.
Get attributes from an image file in MODX.
Tutorial to sandbox MODX Manager Users to edit only a specific Container Resource, and its child Resources. Works best with a CollectionContainer.
Gives content managers the ability to choose from predefined content Chunks, with a specially configured MODX Template Variable (aka custom field or "TV").
A custom php hook to use with MODX FormIt form processing, to add subscribers to an iContact mailing list.
MODX "Contexts" is a powerful feature that allows you to manage multiple domains, subdomains, locations, languages, apps, or anything else, within a single MODX install.
Use the root resource, otherwise known as "Ultimate Parent", to build a navigation element in MODX CMS.
A quick guide to MODX output filters - If and PHx conditional statements made easy, right in the core of MODX Revolution.