SapCap is a SAP packet sniffer and decompression tool for analysing SAP GUI (DIAG) traffic. Using a 3rd-party JNI interface for pCap, it is also able to load previously captured tcpdump files.
Details on running SapCap can be found in the README.txt file included in the zip file.

Author: Ian de Villiers
Cost: Free
Source Code: GitHub
Version: 0.1
License : GPL
Release Date : 2011-09-02

Java runtime environment.
Custom JNI Library.

The custom JNI library is included in the download.

Binary builds of the JNI library are only available for the following platforms:
Mac OS/X
Windows (32-bit)
Linux (32-bit)

If you wish to use a different platform, please download the sources for SAPProx and SapCompress and build the library yourself.