STM Cyber
STM Cyber 3 is a great cybersecurity company whose slogan is HACK THE UNHACKABLE. They perform their own research and develop their own hacking tools to offer several valuable cybersecurity services like pentesting, Red teams and training.
You can check their blog in https://blog.stmcyber.com 5
STM Cyber also support cybersecurity open source projects like HackTricks.