Crammer is a program intended to teach you new foreign words or any other terms, formulas etc. without interruption from your main work.
You can create several dictionaries on the subjects you want to study, then let the Crammer remind you the words in the special "Reminder Strip" - small always-on-top window that you can move into any place on your screen.

You can upgrade your copy of the Crammer to "Pro" edition. Crammer Pro has many additional features which can help you in learning words: word statistic, special "Exam" mode, an ability to store the phonetic transcritpion and articulation for each word, and others.