- HangulDrill: a Korean word and number drill program for people who already know Hangul. Available as an Android application.
- HangulDrill Web: a Web-based version of HangulDrill (for people who do not want to use an Android application). It may work slightly differently.
- Korean-Wikipedia word frequency list (used by HangulDrill).
Author: Thierry Bézecourt (thbz.org). March 2015.