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)
I have used different types of microcomputers even this website is currently being hosted on a raspberry pi, i have experimented with different types of hardware's such as waveshare screens or AI hats.
The pwnagotchi is a cute tamagotchi-like device that has capabilities of capturing handshakes, deauthing devices, wardriving and the list goes on. this little device runs on a raspberry pi zero 2w combined with a sugarpi battery and waveshare display. i have also helped make plugins and customatisations for this device.
I have my very own wifi pineapple which i've tried using with different firmare's. the furthest I got was building a seamless evil twin configured with beEF, this ofcourse only ever being used in a safe testing environment.