Build your own WORDLIST and revise important words while you are no the go, waiting to see doctor etc. You can also save meaning of the word, usages (sentences), synonyms and antonyms. Indispensable tool for GRE, SAT, CAT, GMAT preparations.
This app is open source. The code is on Github. https://github.com/agarwlGaurav/Wordlist-Builder