Spark Modulator 3.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the software is Michael Feilen.
The program's installer file is generally known as SparkModulator.exe. The most popular version among Spark Modulator users is 3.0. The software lies within Multimedia Tools, more precisely Players. We recommend checking the downloaded files with any free antivirus.
From the developer:
Spark is a realtime modulator software for Digital Radio Mondiale (DRM), DRM and other radio standards. The software supports all code rates, bandwidths and robustness modes (A, B, C, D, E) published in the DRM standard as well as all mapping schemes, such as Standard Mapping (4, 16 and 64 QAM), Symmetrical Hierarcical Mapping and Mixed Hierarchical Mapping. Additionally, Spark can generate MDI, AM AMSS, FM RDS signals and much more.
You may want to check out more software, such as Spark Audio Converter, Bright Spark or Spark Dubstep, which might be similar to Spark Modulator.