Hack The Box
- Free up to $20/month if you want a private instance
- Must have VIP to access challenges and retired machines
- My favorite for offensive skills
- Tons of lab walkthroughs for older machines
TryHackMe (Highly Recommended)
- Free up to $10/month for private instances and premium content
- My favorite for beginners and all around infosec skills
- Recommended for blue teamers
Black Hills ANTISYPHON Cyber Range
- $30/month
- Haven't used but would like to try
- Have seen good feedback on social media