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Word reference.com
By simply using the side, blue navigation bar, you can get very complete dictionary-style references for English-Spanish and Spanish-English translations. Easy to understand. Idioms are included. There is also a free download which...
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E Learners
ELearners.com allows people to find online courses and schools that offer those courses.
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Vocabulary Training Exercises
This site contains multiple vocabulary tests of 100 words each that drill word sets from animals to words of the soul. It also contains grammar quizzes and a personalized test generator.
Lingolex
Lingolex.com: Internet Terms in Spanish and English
This site has been successful at defining some very difficult technical internet and computer terms.
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Spaleon: The Conjugation Trainer
The Conjugation Trainer helps a student practice drilling different Spanish verb groups and verb forms. The focus is the present tense, preterit, imperfect, and present subjunctive forms of basic and irregular verbs.