athenahealth (Watertown, Mass.). A health IT vendor, athenahealth boasts more than 5,000 employees, with more than 48 percent of its hires coming from employee referrals. Employees at athenahealth can receive advanced degree sponsorship, paid sabbatical leave after eight years of service and transit and parking subsidies, along with mortgage discounts and free on-site yoga classes. The company also offers paid maternity, paternity and adoption leave.