Ready-made free best man speeches are available at gunthergifts.com, presentationmagazine.com and keepandshare.com. These websites include both serious and funny best man speeches of varying lengths.
Gunther Gifts has eight best man speeches, most of which one can use verbatim except to change the names. Another speech among them is somewhat more personal in nature and requires adaptations of certain details. You can also intermingle the speeches with one another for more customization.
Presentation Magazine offers an example of a speech a prospective best man can use. He should use this speech as a template, changing names and details as well as adding and deleting where appropriate.
Keep and Share features two sections of best man speeches in addition to other wedding speeches. One of the best man speeches is only two sentences long, designed for those who really do not want the spotlight, while the other is a bit longer.