Metalingual is a project mainly written in JAVASCRIPT and RUBY, it's free.
Mobile Wordnik Mightyverse Mashup
This is a mobile mashup of Wordnik and Mightyverse. This cross-platform mobile application uses the Rhodes framework to look up a word's definition in Wordnik and usage across languages in Mightyverse.
You'll need to install Rhombile to compile the app. Follow the instructions at http://wiki.rhomobile.com/index.php/Building_Rhodes_on_Supported_Platforms.
Originally written by Pablo Kang and Sarah Allen.
Copyright (C) 2010 Blazing Cloud, http://blazingcloud.net
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 3 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, see http://www.gnu.org/licenses/.
About the tech used in this app:
Rhodes at http://www.rhomobile.com
Mightyverse at http://www.mightyverse.com
Wordnik at http://www.wordnik.com/