Question

who was founder of digambara sect

Answer 1

One of the most important scholar-monks of Digambara tradition was Kundakunda

Answer 2

Digambara ( "sky-clad") is one of the two major schools of Jainism, the other being Śvētāmbara (white-clad). The word Digambara (Sanskrit) is a combination of two words: dig (directions) and ambara (sky), referring to those whose garments are of the element that fills the four quarters of space.
Founder of Jainism - Mahavira