ICD Stackup Planner - HDI Designer Edition impedance calculator/stackup planner includes multiple differential pair definitions per layer. Allows setup of as unlimited different impedances on a single layer or every layer of the stackup. Once desired number of layers are set, as differential pairs are inserted both the single-ended (characteristic) and differential impedance of each layer are automatically calculated. Exports to CVS.
In-Circuit Design Pty. Ltd., www.icd.com.au