WordAce from Transparent is a good language reference program that acts as a translator and a verb conjugation tool.

With WordAce you can look up what each English word is in Russian and vice versa. The conjugation tool helps you know exactly how a verb can be conjugated so you can say or type the word correctly in a sentence.

We felt WordAce a great tool to use for email correspondence or for writing, but it does not have the ability to teach you Russian.