Yes, Leitner is an effective tool for learning words. Formerly, there was a paper type. Nowadays you can use some software either on your computer or on your cell phone. All these software support downloading different types and categories of words and if you look enough you can find libraries with examples that help you learn the word in context. Even there are some websites full of various card groups. Just search and get what you need. 
P.S. Check out this thread : [بازدیدكننده ی گرامی؛ تنها كاربران می توانند لینك ها را مشاهده نمایند. لطفا ثبت نام نمایید]
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