1.) If you're a DM that runs several games, you can group the PCs in your games into parties to easily load into the initiative list later on.
2.) If you're a DM and you like to prepare encounters beforehand, you can group all monsters that go into an encounter and load the encounter into the initiative list when you need to.
3.) You can add items into the encounter from the creature catalog, or add items from scratch.
4.) Store monsters that you can use to populate your encounters, or add monsters from the catalog to initiative on the fly.
5.) Add items to the initiative list on the fly, or load your PC groups, encounter groups, or items from the creature catalog.
6.) Keep track of hit points (color coded) and armor class.
7.) Keeps track of rounds
8.) You can add items to a wait list and easily add them back in.
9.) You can remove only PCs, only monsters, or all items from the initiative list.
10.) Option to sort descending or ascending.
11.) Manually assign initiative OR auto-roll for only PCs, only monsters, or auto-roll for all.