We have released an implementation of three of the most used CNN in Keras : Alexnet, VGG16 and VGG19. There are coming with pre-trained weights. : https://github.com/heuritech/convnets-keras
Moreover, we have added an option allowing to do some object localization : we transformed all the fully-connected layers into convolution layer, so we are able to compute the network on all sub-frames of size (227,227) on a bigger image.
This tool can be helpful to implement some better classification algorithms, ore some basic localization tools.
The weights can be found here :
The same weights files are used for the fully convolutionize networks, and the original one, so it is lighter.
All the informations you need are on the GitHub repo!