Last December, I did some experiments with deterministic lockstep technology from Photon – TrueSync.

I now learned that this product is no longer in development and will be integrated into their Quantum product. The link to TrueSync now points to the Quantum page. I can no longer find the TrueSync SDK.

You can find more details on their blog post: https://blog.photonengine.com/streamlined-photon-product-portfolio/