Counting the Omer is a mitzvah that connects Pesach to Shavuot, the Exodus from Egypt to the Giving of the Torah on Mount Sinai. This period is also a time of mourning for the deaths of the twenty-four thousand students of Rabbi Akiva. This page offers links to a multitude of websites, online tools and more that will allow you or your student to walk away with a slew of information on all things Sefirat HaOmer related.
Among the resources are:
2 Free Morasha Syllabus Classes
Charts and Infographics