Regal.io

Retell AI lets you connect an AI call agent to Zoho CRM so it can look up customer details, manage leads, and update records while a call is in progress. The Zoho CRM connection is described as an unofficial connector, typically set up through custom API work or a Retell partner.

ElevenLabs provides text-to-speech, voice cloning, dubbing, and speech-to-text tools through a web app and API. It is aimed at creators, developers, and businesses that need high-quality synthetic audio and conversational voice workflows.

Deepgram provides a developer-first Vietnamese speech-to-text API for real-time and batch transcription. It’s built for low latency, noisy audio, and enterprise-scale use cases.

Krisp is a voice AI platform for meetings, call centers, and developers. It focuses on noise cancellation, meeting transcription and summaries, accent conversion, and real-time voice tools.