Saruman is one of the implementation of Black Magic Probe in the favor of a group of old-school hackers. It's 100% compatible with the original Black Magic Probe firmware, so you can use it with any software that supports Black Magic Probe.
Saruman is a powerful tool for debugging embedded systems. It's not only for Alonzo board, but for any hardware that supports JTAG or SWD debugging. Saruman is designed to be easy to use with GNU GDB, making it a great choice for developers who want to debug their code on embedded systems.