Forum OpenACS Improvement Proposals (TIPs): Re: (Proposed) New introductory text on home page
Bullet two: ".LRN is a vertical application build on top of OpenACS that provides Universities with a course management solution and an university oriented interface to the features offered by OpenACS".
Bullet three: Start with "The OpenACS plattform offers developers". This does not break the focus of your speech (either focus on the product or the users. As we do not have a clear target market agreed upon as of now, I would focus on the product).
Bullet four: OpenACS and .LRN are available for free under the conditions of the GNU General Public License (linked).