While the official CliftonStrengths (formerly StrengthsFinder) by Gallup is a paid assessment, there are several high-quality free alternatives and methods to analyze your results.
The High5 Test was explicitly designed as a modern, accessible alternative to traditional corporate strength tests. It uses a framework highly reminiscent of the original StrengthsFinder. free strengthsfinder test
This assessment combines elements of various psychological frameworks to give you a holistic view of your operating style. free strengthsfinder test