Search Schedule From Shared Calendar. ChikkuTakku is service to search schedule from shared calendar and help share calendar
http://krs.ho.ua/openrtty/
http://www.arrl.org/arrl-dx
http://concursos.ure.es/en/eapsk63/bases/
https://rtty.ybdxcontest.com/
http://www.rdxc.org/asp/pages/rulesg.asp