Salt is a training tool which enables saving and loading the game in multiplayer matches with practice partners! It is designed to help people test out the timing and execution of all aspects of their play and I have recieved positive responses from Bronze players, pro players/casters and many people from all levels in between.
Version 2 brings to the table a whole bunch of new features and I am currently looking for feedback from every person I can so that I can make this tool even better.
This should explain all you need to know
Version 1 was covered by Husky ages ago which could give you a rough idea.
The new version contains build order support, auto save, swapping sides with you opponent etcetc.
There are some screenshots of the latest changes here:
HOW TO USE:
just click on the game menu and you will see all the features listed there!
To start just click on a racial icon on the ground.
to swap with opponent click his unit portrait in the loading screen.