Darknet is an open source neural network framework written in C and CUDA. It is fast, easy to install, and supports CPU and GPU computation. You can find the source onGitHub or you can read more about what Darknet can do right here:
If you use Darknet in your research please cite it:
@misc{darknet13, author = {Joseph Redmon}, title = {Darknet: Open Source Neural Networks in C}, howpublished = {\url{https://pjreddie.com/darknet/}}, year = {2013--2016}}