Download SIMQKE-I 2.7 from our website for free. SIMQKE-I is categorized as Education Tools. The actual developer of the free program is Prof. Piero Gelfi.
From the developer:
SIMQKE-1 generates statistically independent accelerograms, performs a baseline correlation on the generated motions to ensure zero final ground velocity, and calculates response spectra.
One of the options in the program generates ground motions whose response spectra "match", or are compatible with, a set of specified smooth response spectra.
You may want to check out more software, such as Wintree, PolicyMaker or World Geography Tutor, which might be similar to SIMQKE-I.