Top 20 NuGet speech Packages

Inspects mp3 audio streams and searches for texts/words
SpeechRecognition API access for your Blazor apps.
A managed client library that makes it easy to work with the Microsoft Cognitive Services Speech Services Speech to Text API on Xamarin.iOS, Xamarin.Android, and Xamarin.Forms, UWP, and/or .NET Standard projects.
This NuGet package provides native and managed libraries for Xamarin iOS with bitcode enabled. Documentation is available at https://aka.ms/csspeech.
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Speech CLI (SPX) is a command line tool for using the Speech service without writing any code. See https://docs.microsoft.com/azure/cognitive-services/speech-service/spx-overview for more information.
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).
SpeechLib - Models
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.
Fluent-ish SSML Generator