Kāśikāvṛttī
The is a commentary on Pāṇini, attributed to Jayāditya and Vāmana, composed in c. the 7th century.
It is considered one of the great grammar texts of Sanskrit after Pāṇini's Aṣṭādhyāyī, Kātyāyana's Vārtikās, Patanjali's Mahabhasya, and Bhartṛhari's Vākyapadīya.