Composition graph for the Upanishads (what texts are in the corpus; how they group).

Upanishads (Vedanta texts)

Later / Sectarian Upanishads (Muktika 108, broadly)

Later compendia often grouped by theme or sect across traditions.

Samanya (general)
Non-sectarian themes and summaries.

Sannyasa (renunciation)
Teachings on ascetic life and letting go.

Yoga
Practice-oriented contemplative methods and discipline.

Vaishnava
Devotional framing centered on Vishnu.

Shaiva
Devotional framing centered on Shiva.

Shakta
Devotional framing centered on Devi/Shakti.

Principal / Mukhya Upanishads

Atharvaveda

Krishna Yajurveda

Shukla Yajurveda

Samaveda

Rigveda

Principal Upanishads associated with the Atharvaveda tradition.

Aitareya

Chandogya

Brihadaranyaka

Taittiriya

Mundaka

Mandukya

Prasna

Principal Upanishads associated with the Krishna Yajurveda tradition.

Katha

Svetasvatara

Maitri (Maitrayaniya)

Principal Upanishads associated with the Shukla Yajurveda tradition.

Isha (Ishavasya)

Principal Upanishads associated with the Samaveda tradition.

Kena

Principal Upanishads associated with the Rigveda tradition.

Kaushitaki (Shakalya)

Classical set most central to early Vedanta and major commentarial traditions.

A corpus of philosophical texts exploring self, reality, and liberation.