[EDLING:291] Vocabulary Software?

[Francis M Hult]

A student of mine asked me about this today and I thought someone
might have ideas.  He is looking for software to study English vocabulary
on his own.  He wants something he can customize.  That is to say, he
wants to choose a specific set of words and then have a program generate
vocabulary tests and possibly exercises for him to do based on his list.
Does anyone know if something like this exists?

Francis