E-Source Home > + Language - Learning E-Source Targets Mango Languages (Mango languages) Mango Languages is an easy to use online language-learning system teaching actual conversation skills for a wide variety of languages, including Spanish, French, Italian, Russian, Greek, German, Chinese, Arabic, and Japanese. Mango uses real-life situations and actual conversations to more effectively teach a new language to learn how to communicate. Specialized ESL courses are also available. Available from home. Funded by the Finger Lakes Library System with help from the Friends of Tompkins County Public Library.