Over the past two decades, some of the biggest success stories in tech have been the SaaS giants. Some industry insiders think COSS, or commercial open-source software, will lead the next wave in tech exits from the venture space. Limited partners investing in tech should be rightfully skeptical of any claims regarding the Next Big Thing. But some of the COSS sector’s internal metrics suggest that developer-centric COSS startups will yield a fair number of eye-popping IPOs a few years down the line.