Cameo is an interesting app. Their main pitch is to make it easy for you to style your videos with not only a preset filter but also supers with nice typography. It's a free app that's definitely worth checking out.
Vee for Video does a good job of letting you splice video clips together and applying preset filters. I've used this a small number of times and liked the easy interface. If I recall correctly, it does not include tools to adjust exposure.