If you are looking for a powerful diagnostic tool, the official version of PCMSCAN offers high-end features that the trial version restricts: Virtual Dashboards
For users looking to maintain their vehicle's health without risking malware, the official trial is the safest way to verify that PCMSCAN works with your specific OBD-II adapter before committing to a full license.
If you have an ELM327 Bluetooth adapter, Android users have access to powerful, free tools: