My developers don’t like the tools I chose for managing development. How do I bring them around?

Unfortunately, this is the one place where compliance is a condition of employment. Gently tell the developers that while you hear their concerns, you have chosen the tools and they need to be used (and share why). 

If there is excessive pushback, you may be running into a confusion of roles and responsibilities – the developer may be laboring under the belief that they have equal say in every decision. You will need to have a difficult conversation with the developer to help them understand they need to agree to disagree, and move on.  You may need to revisit your on-boarding practices to make sure this will not happen with future team members.