DigitalOcean, cloud computing platform for startups and small businesses, says Yancey Spruill will depart as CEO and board member when a successor is found, and it names lead independent director Warren Adelman executive chairman, effective immediately ... Nebula streaming service names YouTuber Sam Denby chief content officer ... Advertising measurement firm MarketCast names Kantar’s Marisa McMahon head-client service, technology and platforms ... Qualys adds Tom Berquist, Cloud Software Group chief financial officer, to its board.