COES: Herramienta Lingüística de Libre Distribución para la Lengua Española - Set of data files that implements a Spanish (castellano) dictionary with 52,000 roots (approx.) and their derivated forms. Includes Spanish spelling dictionary. Based on Unix tool ispell. Distributed under GNU "General Public License of the Free Software Foundation".
Diccionarios.com - Bidirectional translations between Spanish and: English, French, German, and Catalan. Requires cookies, JavaScript, and a 4.0 or later browser.
Technical English - Spanish Vocabulary - A technical vocabulary useful in helping the students, technicians and engineers to overcome the difficulties of translating from English into Spanish.
Tomísimo - Spanish and English Dictionary - Provides two-way searches, organizing results by relevancy. Allows wildcards. Accepts new words and phrases into the growing corpus of over 11,000 translations.