A generic dynamo implementation for different k-v storage engines

OrioleDB – building a modern cloud-native storage engine (... and solving some PostgreSQL wicked problems)

A Redis Module that make it possible to create a consistent Raft cluster from multiple Redis instances.

Simple evented I/O for Ruby.

Fine-grained concurrency for Ruby

Secure random number generation for Ruby using system RNG facilities

HyperLogLog implementation for Ruby (as a C extension)

index server