Ghidra is an open source reverse engineering tool released earlier this year. IDA Pro is a commercial competitor, is best in class, but costs on the order of ~$3,000 to get the premium package with the decompiler.
By adding SuperH SH-1/SH-2/SH-4 support, it's now possible to disassemble and decompile code for that processor. The Sega Saturn uses SH-1/SH-2 CPUs, Sega 32x uses SH-2, and Dreamcast uses SH-4. The SuperH family is of course used in many other embedded devices such as car automation and networking devices.
To see what Ghidra is capable of, take a look at this thread: https://www.obscuregamers.com/threads/playstation-re-toolchain-for-ghidra.895/post-5223
wrote a Playstation loader for Ghidra. The screenshot shows him loading a PS binary, and then without any manual intervention Ghidra has decompiled the source code on the right.
And to answer your question, yes you can start reverse engineering Bleemcast with Ghidra.