There is no "full feature" free trial. The Chimera trial version allows you to run the software and check if it detects your specific device, but it will not execute any repair procedures until a license is associated with your account.
To get notified, sign up for the official Chimera Tool newsletter (not third-party spam sites). During these events, you can use the tool 100% free for a limited time.
The standard price for Chimera Tool is approximately for a single-user license. For many repair shop owners, this is a bargain. But for an individual trying to unlock their own phone, that price tag feels steep. Hence, the desperate search for a "Chimera Tool free account."