Garageband is an app that allows you to record your voice, play virtual instruments, and so much more! It works great for projects that you just need audio for.
iMovie is an app that lets you make movies and trailers. It is very easy to use to. All you do is select if you want a movie or trailer and then all you do is add pictures and videos to the slots.
On trailer you have the option of retro, romance, scary, superhero, swashbuckler, narrative, fairy tale, expedition, or bollywood for a template. These will and music and make them even more awesome.
iMovie Trailers - Romantic Comedy
Haiku Deck is an alternative to a presentation. You can focus more on the information you are putting in, than the appearance. You can add a background image if you want. Haiku Deck slides look like a giant flash card without the lines. You can have a tittle then some information. Haiku Deck makes presentations fast and easy to make.