Gauranga
Krishna is the highest reality. The relationship between Krishna and soul is simultaneously one and different in a way the human mind cannot grasp — therefore acintya, inconceivable.
Loving devotion to Radha-Krishna, expressed through public chanting (sankirtana) of the maha-mantra "Hare Krishna Hare Krishna Krishna Krishna Hare Hare / Hare Rama Hare Rama Rama Rama Hare Hare", is the only and complete path in this Kali Yuga. Chaitanya himself wrote almost nothing — eight verses, the Shikshashtaka — but his disciples (the Six Goswamis of Vrindavan) produced an enormous body of theology.
The Gaudiya Vaishnava tradition. ISKCON (founded by A.C. Bhaktivedanta Swami Prabhupada in 1966) is the modern global expression. Many sadhus and gurus still trace their parampara through the Six Goswamis.