GridDB is a next-generation open source database
A free, open-source, and cross-platform big data analytics framework
Active, high-performance open source database middleware
Out-of-Core hybrid Apache Arrow/NumPy DataFrame for Python
sparse and dense matrix, linear algebra, visualization, big data
Big Sack: A lightweight Java Key/Value store with undo and disk cache.
Fast customizable time series web database for big data like log files