.NET has some speech synthesis and listener libraries. They work pretty well; I built a modestly-functional chat bot once with them. Not sure about the overall .NET licensing arrangement, but I heard it was moving towards open source.
Though they feel abandoned, and there hasn't been much recent activity around them. Microsoft probably has all speech engineers working on Cortana instead. (Though I'd be surprised if she's not using .NET at some level.)
Though they feel abandoned, and there hasn't been much recent activity around them. Microsoft probably has all speech engineers working on Cortana instead. (Though I'd be surprised if she's not using .NET at some level.)