vector-clock (hackage): This package provides a ready to use implementation of the vector clock data-structures, which may be used to version messages and determine causality relations between them in a distributed system.  See Fundamentals of Distributed Computing: A Practical Tour of Vector Clock Systems by R. Baldoni and M. Raynal for an overview of vector clocks.  See the README.md file for details.
Keywords: data|data-structures|distributed-computing|gpl|library