The following details were taken directly from the Vocaboly website.
Main Features
Big Vocabulary
Vocaboly contains five books: “VOA Special English”, “TOEFL”, “GMAT”, “SAT” and “GRE”, with more than 12,000 words, each word contains meaning, phonetic symbol and pronunciation (decent American accent). You can select a book according to your purpose and English level.
Word Cards
Every book contains eight flash cards, after you put some words into these cards, you can select a card to study, so you can easily focus on the words you want to learn.
Word Difficulty Level
Each word can be assigned to a difficulty level from 0 to 5, the default difficulty level is 0. You can learn the words in whatever difficulty level you choose. Combined with word cards, you can easily pick up the words that you are unfamiliar with.
Multi–User support
Each user has his own study record and software setting which is saved automatically when you quit the program.
Study
Word Ticker
Recall
Spelling
Test
Listening
Multi–Choice
Game
Memory
Star War

Ask & Answer