Organization / Provider	Notable Certifications / Courses
0xDarkvortex	Red team & malware dev courses
Altered Security	CREST CRT, practical pentest tracks
BC Security	Red team & Empire-focused courses
CompTIA	Security+, PenTest+, CySA+
Constructing Defense	Defensive & blue team labs
Cyberwarfare live	Live red team training
CloudBreach	Cloud pentest courses
eLearnSecurity (INE)	eJPT, eCPPT, eWPTX, eCXD
GIAC	GSEC, GPEN, GXPN, GREM, GCIA, etc.
HackTheBox	CPTS, CBBH
(ISC)²	CISSP, CCSP, SSCP, CSSLP
Maldev Academy	Malware development courses
Microsoft Azure	AZ-500, SC-200, SC-300, SC-400
Offensive Security	OSCP, OSWE, OSEP, OSED, OSCE3
PortSwigger	Burp Suite Certified Practitioner
Practical-DevSecOps	DevSecOps certification
Pwned Labs	Hands-on pentest labs
RedTeamAlliance	Red team courses
RedTeamSorcery / Pointersec	Advanced red team tactics
RedTeamTacticsAcademy	Red team training
SANS	SEC401, SEC504, SEC560, FOR508, etc.
Security Blue Team	Blue Team Level 1 & 2
Sektor7	RTO malware dev courses
Signal Labs	Advanced offensive courses
SpecterOps	BloodHound Enterprise, AD attack courses
TCM Security	PJPT, PNPT, PEH, CRTP
TrainSec	Windows internals, malware reversing
WhiteKnightLabs	Offensive tooling & training
XINTRA Training	Labs for incident response, CTF
Zero2Auto	Zero2Automated reversing
ZeroDayEngineering	Vuln research, hypervisor
Zero-Point Security	CRTO, CRTO II