hi
You will get free Modelsim XE starter version along with ISE. You can use that for simulation of cpld and fpga. Simulation libraries are precompiled in that.
with ise pack modelsim comes as a standard but this is a beginers pack which they have named MODELSIM XE. when u install this ise modelsim doesnot installs automatically u have to do that manually and after installing u have to configure it with ise then u can simulate ur designs directly from ise.