Android: If you’d prefer to swipe your finger to switch between apps (instead of opening the task switcher) SwipeSwitcher enables simple swipe-based switching.
SwipeSwitcher allows you to specify four applications/actions (one for each side of the screen). Swipe your finger from that side towards the opposite side in order to launch the specified application without accessing the app drawer or pulling up the the built-in Android task switcher. If you find yourself routinely switching between a handful of applications, SwipeSwitcher stands to save you quite a bit of time.
Hit up the link below to check out more screenshots. Swipe switcher is free, requires Android 2.1+.