The website Modersmål Jiddisch (mother tongue Yiddish) was created under the auspices of the Swedish governmental school authority. As Yiddish is one of five officially recognised minority languages in Sweden it is included in the educational policies of the government. The website is meant to serve teachers, learners and the general public. Among the information that is offered are a web course in Yiddish (for children), useful weblinks, reading suggestions, and more.
More information on languages in Sweden can be found on this page on the Swedish government website and particularly in this fact sheet. See also this Wikipedia page on minority languages in Sweden.