As of today, we are finally open-sourcing X-Stream. Head over to Github and fork us today! License is Apache 2.
Note: Although I am not an author of the X-Stream paper, I was involved in its development, and as such I am the code maintainer. I also supervised Junyao Zhao, an intern, who added HDFS support.
X-Stream is a system for analytics on big graphs using secondary storage on a single machine. X-Stream is based on the philosophy that sequential access to data works best for all storage mediums: main memory, SSD and magnetic disk. It is therefore built around a storage-centric and streaming philosophy: rearrange graph algorithms to stream data from storage.