The stock App Switcher looks alright, but it's not as useful as it could be. Apple limits what you can do inside the App Switcher to force-quitting apps, but as jailbreak developers have shown for years, there’s so much untapped potential.
A new free jailbreak tweak called EnhancedSwitcherClose by iOS developer DGh0st provides you with a new way to interact with your App Switcher cards and gives you more options depending on the way you swipe them.