maisdesign

It disable Post editor for Non Administrators and let you create posts only using Custom Fields (remember to configure them first!) 
It uses: if ( ! current_user_can( ‘install_plugins’ ) )
Actually there is no Admin Panel for this plugin if you would like to change minimum permission or role you’ll have to change it manually via FTP
<h3>Feature Request</h3>
Any feature request? Drop me a line: marco@maisdesign.it
This plugin is based on a conversation here: 
<a href="http://wordpress.stackexchange.com/questions/45113/how-to-disable-edit-post-and-allow-only-custom-field/45158#45158" rel="nofollow ugc">WordPress.Stackexchange</a>

Editor Remove

It disable default Post Editor and let users like Authors and Editors (not Admin) to write posts only using custom fields.

sparkweb

This plugin lets you edit the custom fields for many posts at once. Designed to work with pages, posts, and all custom post types. The plugin also has some actions included so that plugins and themes can integrate seamlessly and build their own extensions into the functionality.

Custom Field Bulk Editor

This plugin lets you edit the custom fields for many posts at once. Designed to work with pages, posts, and all custom post types.

Editor Remove vs Custom Field Bulk Editor