The Nyaya Sutras, attributed to the sage Gautama, are the primary text of the Nyaya school, which focuses on logic and epistemology.

The Upanishads are a collection of philosophical texts found in the Atharvaveda, one of the four Vedas, and are known for their exploration of spiritual and metaphysical concepts.

The Samkhya Karika, attributed to the sage Kapila, is the primary text of the Samkhya school, which focuses on the dualism of purusha (consciousness) and prakriti (matter).

The Bhagavad Gita is a philosophical dialogue found within the Mahabharata, one of the two major ancient Indian epics.

The Yoga Sutras, attributed to the sage Patanjali, are the primary text of the Yoga school, which focuses on the practice of yoga for spiritual liberation.

The Vaisesika Sutras, attributed to the sage Kanada, are the primary text of the Vaisesika school, which focuses on the analysis of categories and the nature of reality.

The Mimamsa Sutras, attributed to the sage Jaimini, are the primary text of the Mimamsa school, which focuses on the interpretation and application of the Vedas.

The Vedanta Sutras, attributed to the sage Badarayana, are the primary text of the Vedanta school, which focuses on the interpretation and understanding of the Upanishads.

The Lokayata Sutras, attributed to the sage Brihaspati, are the primary text of the Charvaka school, which focuses on materialism and hedonism.

The Puranas are a vast collection of texts that primarily focus on mythology, legends, and stories related to ancient Indian deities, heroes, and historical events.

The Arthashastra, attributed to the sage Kautilya, is an ancient Indian text that primarily focuses on political science, statecraft, and the art of governance.

The Kamasutra, attributed to the sage Vatsyayana, is an ancient Indian text that primarily focuses on erotic love, sensual pleasure, and the art of lovemaking.

The Manusmriti, attributed to the sage Manu, is an ancient Indian text that primarily focuses on social laws, dharma, and the duties and responsibilities of individuals in society.

The Ramayana and Mahabharata are two of the most famous ancient Indian epics that primarily focus on heroic deeds, moral values, and the struggles of individuals and societies.

The ancient Indian philosophical texts have had a profound impact on Indian culture and civilization, shaping its values, beliefs, and practices for centuries.