"Independence Forever" was, of course, John Adams’ final toast to his countrymen. His eldest son, however, gave serveral major addresses on July 4th. Thus far, I have found the full text of two of them available online.
On July 4, 1821, Adams gave an address in Washington, DC. And on July 4, 1837, Adams gave an address to the city of Newburyport, Mass. (He also gave July 4th addresses in 1793, 1828, and 1831).