ContinentsPlus, PangaeaPlus, Amazon, Donut and Sandstorm are the 5 map scripts in that pack.
The 'Plus' maps come with added island chains. What I like less about them is that the City States have been scripted to only appear on these islands, and away from the land masses where you will spawn.
I've cut out that part of the map script to get the CS distribution back to normal. In 'Modding tutorials and Guides' I've written a small instruction on how you can do that.