Ostinato is an open-source, cross-platform packet/traffic generator and analyzer with a friendly GUI. It aims to be “Wireshark in Reverse” and thus become complementary to Wireshark. This is the source code release.
You can download it from the following link: https://packetstormsecurity.com/files/download/107584/ostinato-src-0.5.tar.gz
Source: https://packetstormsecurity.com/files/107584/Ostinato-Traffic-Generator-0.5-Source-Code.html