Top 20 NuGet speech Packages

A small utility package that converts MarkDown to Ssml
This library allows you to assign any actions performed on the voice command.
WebTTS.GoogleTranslate provides Google Translate Text-To-Speech service to WebTTS core. Read more on GitHub repo.
WebTTS.Ivona provides Ivona Text-To-Speech service to WebTTS core. Read more on GitHub repo.
Baidu Audio Speech Recognition. You can only get DLL from Baidu official website. I package it up for .net core use.
Inspects mp3 audio streams and searches for texts/words
Fluent-ish SSML Generator
A speech-to-text plugin that use the Bing Speech API
Yandex.SpeechKit is a speech recognition library for Windows Phone.
Microsoft Kinect for Windows SDK v2. Provides data source APIs for Kinect.
Accessible Output allows you to create programs which speak either using the deault Windows (SAPI) voice, or to speak using a screen reader's API (providing a more natural user experience).
Microsoft Cognitive Services Speech Recognition API C# Client Library for x86 build
Microsoft Cognitive Services Speech Recognition API C# Client Library for x64 build
SpeechLib - Models
Microsoft Speech Recognition Service SDK can be used to do speech transcription. If you have a service which needs to utilize the power of Microsoft Speech transcription capabilities, this library can be used.
A packaging of MS System.Speech.dll assembly to be installable through nuget.
Xamarin and Windows plugin to perform text to speech functionality. Adjustable pitch, speak rate, locale, and more.
This library simplifies calling Microsoft.CognitiveServices.SpeechServices.
IBM.Watson.VisualRecognition.v3 wraps the Watson Visual Recognition service (http://www.ibm.com/watson/developercloud/visual-recognition.html)
IBM.Watson.ToneAnalyzer.v3 wraps the Watson Tone Analyzer service (http://www.ibm.com/watson/developercloud/tone-analyzer.html)