This is a custom firmware written for the Proxmark3 device. It extends the currently available firmware. This release is nicknamed Frostbit.
https://packetstormsecurity.com/files/165531/proxmark3-4.14831.tar.gz
This utility looks for log4j in the currently running JVM. It is useful for systems that allow plugins to introduce their own jars. Therefore, you can find if someone is using log4j with a dangerous version.
https://packetstormsecurity.com/files/165310/log4j-recognizer-main.zip