XPR Crypto

Ripple is a real-time gross settlement system, currency exchange and remittance network created by Ripple Labs Inc., a US-based technology company. Wikipedia
Initial release: 2012
Original author(s): Arthur Britto, David Schwartz, Ryan Fugger
Written in: C++
License: ISC license
Operating system: Server: Linux (RHEL, CentOS, Ubuntu), Windows, macOS (development only)
Stable release: 1.0.0 / 15 May 2018
Created by: Chris Larsen, Brad Garlinghouse