<p>OpenOffice has presentation software (Impress) already built into it, and I think it can share some MS Powerpoint files.</p> <p>Also there is KDE's KPresenter.</p> <p>If you choose OpenOffice, you have the advantage of being able to run it on Linux, Mac and Windows. Create your presentation on one, and share it with the others.</p> <p>On the other hand, although you can include sound with OpenOffice, you have a limited range of file formats to choose form, and you can't create an integrated final file with the sound embedded in it. There are a lot of issues with Impress and sound.</p>