Developer Plugins
MediaURLs is a free plugin for Movable Type 4.x that provides a few simple template tags that allow you to easily make use of multiple domains or subdomains to host media assets for your site such as css and javascript...
Configuration Assistant for Movable Type allows you to easily design an entire settings page for your theme or plugin complete with field sets, labels, default values, pull down menus, radio buttons, check boxes, text areas, and text input fields for...
Entry information is output to YAML and the JSON format. It is a plugin for the programmer....
Templets plugin realizes "pluggable template sets" called "templet", and allows you to install and manange new templates very straightforwardly and flexibly. It makes it easy: For users to customize their base template sets by plugging in various kinds of templets,...
The Log4MT plugin enhances Movable Type with the fantastic and ultra-powerful Log4Perl logging framework. Like Log4perl, Log4MT enables you to debug your code, handle exceptions or send notifications with exacting control. This plugin is a intended for use by Movable...
Tidy for Movable Type keeps your template markup formatting uniform and more readable. Movable Type 4 introduced the support of case insensitive tag names that do away with nagging and generally silent publishing errors because the wrong case was used...

Create and Manage
by Maarten Schenk
This plugin adds a 'Create' and 'Manage' menu to Movable Type 5, so plugins written for Movable Type 4 that add submenu-items there will work again. Note that the menus will only appear if there are plugins installed that actually...