VMware offers free hands-on labs to gain access to their products and solutions.

Sonicwall offers free but limited product demos for its' security appliances and firewalls.

Solarwinds offers a free hands on demo environment to learn their Security Event Manager (SEM)

Palo Alto offers scheduled demos that you have to register for but are free. (Only Free Trials and Test Drives)

This is a free 7 day trial/evaluation of Tenable Nessus. This will give experience with vulnerability scanning.

Take a free test drive on Juniper offerings such as vMX, vSRX, Apstra Fabric Conductor, Security Director, etc.

Test drive Crowdstrike Falcon and its' offerings such as Prevent, Falcon X, Falcon Firewall Management, etc.

Tenable is offering a free Trial for 30 days of their cloud offering, Tenable.io.

GNS3 is a network emulator perfect for practice configuring network devices and setting up network architectures.

Pentester Lab is a great way to learn about web and application security and how it can be subverted.

Get some experience with hacking, pentesting, and learn about vulnerabilities as well as exploits.

VulnHub was born to cover as many as possible, creating a catalogue of 'stuff' that is (legally) 'breakable, hackable & exploitable' - allowing you to learn in a safe environment and practice 'stuff' out.

Hands-on training with real cybersecurity scenarios.

This is a free class for web security. This site has CTF and can help you get started with bug bounties.

There's a free 7 day trial of Elastic SIEM. The SIEM is what's known as the (ELK) Stack which combines Elasticsearch and Kibana.