Upnishad(32)

Mukhya( मुख्य)
Taittiriya, Katha, Śvetāśvatara, Maitrāyaṇ
Sāmānya(सामान्य)
Sarvasāra, Śukarahasya, Skanda, Garbha, Śārīraka, Ekākṣara, Akṣi
Sannyāsa(संन्यास)
Brahma, (Laghu, Brhad) Avadhūta, Kaṭhasruti
Śāktai (शक्ति )
Sarasvatī-rahasya
Vaiṣṇava(वैस्नव )
Nārāyaṇa, Kali-Saṇṭāraṇa
Śaiva (शैव )
Kaivalya, Kālāgnirudra, Dakṣiṇāmūrti, Rudrahṛdaya, Pañcabrahma
Yoga(योग)Amṛtabindu, Tejobindu, Amṛtanāda, Kṣurika, Dhyānabindu, Brahmavidyā, Yogatattva, Yogaśikhā, Yogakuṇḍalini, Varāha
Source: Wikipedia