Looking for Apple software to do slide show

Here is an app that may help.

• Keynote - Apple

Photos and iMovie are on every Mac sold.

 Others, in order of price:

PhotoToMovie  $49.95

PulpMotion  $129

FotoMagico $99 

Final Cut Pro X $299

It's difficult to compare these apps. They have differences in capability - some are driven off templates. some aren't. Some have a wider variety of transitions. Others will have excellent audio controls. It's worth checking them out to see what meets your needs. However, there is no doubt that Final Cut Pro X is the most capable app of them all. You get what you pay for.