The initial public offering (IPO) of Excelsoft Technologies, a global vertical SaaS company focused on the learning and assessment market, will open on November 19 and close on November 21, according to the red herring prospectus (RHP). The Rs 500 crore IPO of the Karnataka-based company is a combination of a fresh issue of equity shares aggregating up to Rs 180 crore and an offer for sale (OFS) of shares of Rs 320 crore.