Open Source Projects related to CNNs to Contribute To? [D]

Around a decade a go I was tinkering a lot with CNNs for real time event detection. I enjoyed that a lot and always wanted to get back into machine learning, but never really got to it.

I was wondering if you can recommend open source projects related to CNNs, or AI applications for image / video in general that I could contribute to, to get back into that? Currently, with the AI hype, it feels like you either just apply AI, or work for a big AI lab. Feels like there isn't anything in the middle anymore.