The Best Commencement Speeches, Ever has an index of 316 commencement speeches. The speeches are listed alphabetically by speaker's first name. Instead of searching by speaker's name you can search according to theme, school, or date. A transcript for each speech is available. Videos are available for many of the speeches. One of my favorite speeches, from Bill Cosby, is embedded below.
Applications for Education
It's probably a little late for this year, but for future years NPR's The Best Commencement Speeches, Ever could be a good source of inspiration for crafting graduation messages to share with students.
H/T to Open Culture.