Thrawn's Revenge is a large-scale mod for Empire at War: Forces of Corruption. It includes the events of the Galactic Civil War after Palpatine's death at Endor, up until the signing of the Pellaeon-Gavrisom treaty. If you own the Steam version of EaW, you will have to complete extra steps to run the mod after installation. Please see the manual for these steps.
We've been talking about improving documentation in the mod, and this is one part of a series of quality of life changes to help people have more accessible information while ingame. The history graph in EaW has always been helpful in figuring out who still has what, but unfortunately in a mod like TR which adds factions beyond the original 3, it's not super useful because they can't be added. So, Evilbobthebob has created a stats page in the mission holocron which will tell you at any given time how many planets everyone has, what their proportion of the galactic military power is, and other information (currently, it says what the income is for other factions- this may change)