Andrew Norcross

tripflex

Creates a panel to change or delete meta keys in bulk. Useful for when you are switching plugins or themes that use specific meta keys for functionality, or for general cleanup for older sites that may have older meta data that is no longer in use.

Post Meta Manager

A simple utility plugin for changing or deleting post or user meta (custom fields) keys in bulk.

Eric Marden

adsdevshop

Easily export the metadata stored by one plugin or theme to another plugin or theme.
Data Portability is important. Data Portability allows you to easily move from one system to another and take your content with you. Metathesis allows you to do just that.
This plugin provides an easily extensible system for registering import and export sources. Out of the box it exports the Search Engine Optimized Title, Description, and Keywords data stored by the Thesis Theme a CSV file. It also ships with a second and third adapter to export the Thesis SEO data to the All in One SEO Pack plugin and vice versa.
More adapters are planned, and new ones can be written very easily by extending the Metathesis class and registering your adaptor via a WordPress filter provided by Metathesis. (Documentation forthcoming).
<h3>License</h3>
The Metathesis plugin was developed by Eric Marden on behalf of Robert Dempsey and Atlantic Dominion Solutions, LLC and is provided with out warranty under the GPLv2 License.
Copyright 2010 Robert Dempsey
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Metathesis

Migrate your SEO goodness and other meta-data from one theme or plugin to another WordPress theme or plugin.

Post Meta Manager vs Metathesis