Flickr for ExpressionEngine happily marries Flickr and your EE-powered website. The add-on gives you several options for integrating Flickr - a Flickr Fieldtype, a handful of template tags, and Wygwam/Matrix compatibility.
Field Pack gives you a handful of useful little fieldtypes.
Allows you to select from your Freeform Templates (used for emails). Can be used in a Matrix Fieldtype, Low Variables or as a standalone.
Freeform fieldtype that pulls in templates or fields in data from Solspace's Freeform module.
This fieldframe utilizes jQuery uploadify plugin to provide a visual feedback of all uploads and to allow multiple uploads.
File Field Audio Preview dynamically adds a tiny audio player to MP3 audio files selected via nGen File Field fields in the control panel, complimenting the built-in image previews offered by the fieldtype.
FF Multiselect UI gives you a multi-select input with two interested UI mode.
Is some sort of by-product of MX Category UI.