Myers-Briggs Type Indicator (MBTI): The MBTI assesses personality based on four dichotomies: Extraversion/Introversion, Sensing/Intuition, Thinking/Feeling, and Judging/Perceiving. You can find free versions of the MBTI online, although the official assessment usually requires payment.
Big Five Personality Test: The Big Five model measures personality based on five traits: Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism (OCEAN). Various websites offer free versions of the Big Five test.
16Personalities: This test is based on the Myers-Briggs Type Indicator and provides a detailed personality profile with insights into your strengths, weaknesses, and preferences. It's available for free on the 16Personalities website.
Human Metrics Jung Typology Test: This test is similar to the MBTI and provides a Jungian-based personality assessment. It's available for free on the Human Metrics website.
SAPA Project: The SAPA Project offers a comprehensive personality test based on the Big Five model. It provides detailed feedback on your personality traits and is available for free on the SAPA Project website.
Enneagram Test: The Enneagram is a personality system that categorizes individuals into nine different personality types. Several free Enneagram tests are available online, such as the one on the Enneagram Institute website.
The HEXACO Personality Inventory: This test measures six personality dimensions: Honesty-Humility, Emotionality, eXtraversion, Agreeableness, Conscientiousness, and Openness to Experience. While some versions may require payment, free versions are also available on various websites.