Producer Bundle is described as 'new and modern marketplace for any kind of musicians, producers, DJ's, recording studios, film and soundtrack producers etc' and is a music production app in the audio & music category. There are three alternatives to Producer Bundle, not only websites but also apps for. The best alternative is Pluginboutique, which is free. Other great sites and apps similar to Producer Bundle are VSTBuzz and KVR Marketplace.
VSTBuzz showcases and provides great deals on audio software and bundles. It's sort of like Humble Bundle but for music apps, with timed offers on hand-picked audio gear to help you find the best at unbeatable prices.