Zwoptex is described as 'Use Zwoptex to create sprite sheets in just a couple of clicks. With powerful features, turbocharged algorithms and an elegant interface sprite sheets could never be easier'. There are six alternatives to Zwoptex for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Android. The best alternative is TexturePacker, which is free. Other great apps like Zwoptex are ShoeBox (Free), rucksack (Free, Open Source), Sprite Sheet Packer (Free, Open Source) and GameDevUtils.com (Free, Open Source).