ARMv7 processor simulator: https://cpulator.01xz.net/
ARMv7 simulation (Docker): http://linux-kernel-lab.blogspot.com.br/2018/04/basics-on-arm-processor.html
Lab. Microprocessadores PCS3432: https://www2.pcs.usp.br/~jkinoshi/2022/labmicro-22sem.html
Curated list of many, many systems administrator tools: https://github.com/awesome-foss/awesome-sysadmin?tab=readme-ov-file