the flipperzero is a pentesting multitool which i've tested lots of firmwares and codes on.
Bjorn is a portabale vulnarability scanner that uses many ways of nmap portscanning and bruteforce protocols (and more)
Esp32's i've used a lot, both in simple matters like connecting 2 things together but also as wifi hacking/testingtools
The blue-esp is a Sub-Ghz and or bluetooth scanner/reader i've helped design, this has many functions and could also be used as a jammer (this is not what its used for)