Very well known password recovery utility. Is under active development and can be found in many other Linux flavour repos such as Ubuntu, Arch, Debian
We have hashcat available in solus now but unfortunately AMD users need a Ryzen CPU with an RX card in order to utilize it as it uses AMD's new Rocm OpenCL driver and older hardware isn't supported.
Please provide john as a CPU alternative. It builds and runs fine on Solus at the moment.
Note: The GPU extension (compile john with an extra flag, not default behavior) uses AMD APP SDK and I don't know if it will break with amdgpu. Possibly test?