OpenHFT it is Open Source from Chronicle Software. 
It provides tools to help with the full life-cycle of the trade across multiple asset classes

Overview - https://github.com/OpenHFT/OpenHFT
Open Source - https://github.com/OpenHFT

Docs and info:

Low level Java programming
With examples from OpenHFT
​
Microservices in the Chronicle world - Part 1
Microservices in the Chronicle world - Part 2
Microservices in the Chronicle World - Part 3
Microservices in the Chronicle world - Part 4
Microservices in the Chronicle world - Part 5

Concept architecture:

Engine: Customisable Data Fabric, Reactive Live Queries
Queue - Persist every event
Map - Persist Key-Value
Network - Remote access
Wire - YAML, Binary YAML, JSON, CSV, Raw data
Threads - Low latency
Bytes - 64-bit off heap native + memory mapped files
Core - Low level access to OS and JVM
Binance-Api-Client - bridge for crypto exchange