Not a competitor. We work closely with the Mono team, specifically Miguel. We are releasing lots of source for them with each .NET Framework release. The Mono team is adopting large quantities of that source to improve Mono. It&#x27;s a collaboration.<p>Certainly, there are now two .NET choices on Linux. If you ask Miguel, I suspect he&#x27;d recommend .NET Core if you are building a server app.<p>Disclosure: .NET Core team member