Frame-Axiom----Erlang-Run-Time-Diff-Tool- is a project mainly written in Erlang, it's free.
Did my stuff change anything? Unless stated, it should not. Frame Axiom to the rescue.
Frame Axiom : A run-time 2 point diff tool to ease testing of heavily side-effecting code.
Status: In progress, mutating and converging to a uniform [{Type,[Option]}] interface
Examples: Check EUnit test in test/ dir
Promise: I promise 100% test coverage and self-explaining EUnit tests
License: New BSD License [3 clause License]