Monsanto

While the seed producer has plenty of ways to build a career with professional groups and leadership exchanges via offline relationships, it has also built an online mentoring tool. Employees can ask questions, seek specific people for advice, or even set up coaching. It's a way to "network and build relationship with folks," said Dipal Chaudhari, a brand manager. Just don't expect a response on weekends, as there's an informal rule of no emails when you're off the clock. Read the Great Place to Work review.