Twilio - Brings voice and messaging to your web and mobile applications.
Go Transcribe - Advanced cloud based transcription service powered by artificial intelligence
Plivo - Plivo simplifies your customer engagement.
Podcast Transcribe - Convert Podcast to text, upload an audio file to get the transcription.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Sonix - Automatically convert audio & video to text in minutes