Rohde & Schwarz FreRes
The 4.3.1 version of Rohde & Schwarz FreRes is provided as a free download on our website. Our antivirus check shows that this download is clean. The actual developer of the free software is Rohde & Schwarz GmbH & Co. KG. The program lies within Office Tools, more precisely Calculators.
From the developer:
Use this program to measure the frequency and/or level response of a device under test, using a generator as signal source and a power meter, a receiver or a spectrum analyzer as indicator.
You may want to check out more software, such as Rohde & Schwarz RSCommander, Rohde Schwarz RSIB-VISA or Rohde & Schwarz dBCalculator, which might be related to Rohde & Schwarz FreRes.