STM Cyber 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.
Security Skills as a Service platform bridges the current skill set gap by combining global offensive security talent with smart automation, providing real-time data you need to make informed decisions.
Intigriti is the Europe's #1 ethical hacking and bug bounty platform.
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WebSec is a professional cybersecurity company based in Amsterdam which helps protecting businesses all over the world against the latest cybersecurity threats by providing offensive-security services with a modern approach.
WebSec is an all-in-one security company which means they do it all; Pentesting, Security Audits, Awareness Trainings, Phishing Campagnes, Code Review, Exploit Development, Security Experts Outsourcing and much more.
Another cool thing about WebSec is that unlike the industry average WebSec is very confident in their skills, to such an extent that they guarantee the best quality results, it states on their website "If we can't hack it, You don't pay it!". For more info take a look at their website and blog!
In addition to the above WebSec is also a committed supporter of HackTricks.
INE is a great platform to start learning or improve your IT knowledge through their huge range of courses. I personally like and have completed many from the cybersecurity section. INE also provides with the official courses to prepare the certifications from eLearnSecurity.
INE also support cybersecurity open source projects like HackTricks :)
Courses and Certifications reviews
You can find my reviews of the certifications eMAPT and eWPTXv2 (and their respective preparation courses) on the following page: