redsn0w is described as 'utility that will jailbreak your iPhone or iPod Touch, allowing it to run apps that are not approved by Apple' and is an app in the system & hardware category. There are six alternatives to redsn0w for iPhone, iPad, Mac, Windows and Linux. The best alternative is 3uTools. It's not free, so if you're looking for a free alternative, you could try checkra1n or Animate. Other great apps like redsn0w are PkgBackup, iSHSHit and unc0ver.
redsn0w is mainly a iOS Jailbreaking App but alternatives to it may also be iPhone File Managers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of redsn0w.
3uTools is the most efficient iOS file and data management tool for Apple users. 3uTools provides one-click downloads for iOS users with free genuine iOS apps, popular games, free ringtones, and HD wallpapers.
unc0ver is a jailbreak, which means that you can have the freedom to do whatever you would like to do to your iOS device. Allowing you to change what you want and operate within your purview, unc0ver unlocks the true power of your iDevice.