5G network-traffic fuzzer and replay engine (built on Montimage's MMT). Takes captured 5G control-/data-plane traffic, lets you write rules to modify fields, and replays the altered packets, online or offline, toward a target 5G component (AMF/SMF over NGAP/SCTP, or a gNB) for protocol fuzzing and attack-injection testing. Operates on traffic, not radio: it consumes a capture (e.g. from Wireshark) and a target core, no SDR.
Lifecycle not assessed: nobody has checked yet whether this tool is still maintained, sold or working. Check the project's own page before relying on it.