Here are some tools and platforms available for editing Speech Synthesis Markup Language (SSML), which can enhance the naturalness and customization of synthetic speech:

1. Woord SSML Editor: This online editor allows you to create rich audio experiences by using SSML to make speech sound more natural. More features such as whispering are also available.

   • Woord SSML Editor

2. Optimizely SSML Editor: This app provides a standard way to enhance text content with SSML tags, which are essential for the generation of synthetic speech.

   • Optimizely SSML Editor

3. VoiceComposer SSML Converter: An application to convert text and SSML text to speech with access to 800 voices for voice composition.

   • VoiceComposer SSML Converter

4. Company-X Text-to-Voice SSML Editor: This allows for control over emphasis, pitch, speed, and tone using SSML tags, simplifying the creation of customized voice outputs.

   • Company-X SSML Editor

5. SSML Editor for Audio Experiences: This tool is designed for smart speakers and digital assistants, helping produce more natural sound outputs.

   • SSML Editor Azure

These platforms provide varying degrees of customization and ease of use, depending on your specific needs for SSML editing. Each tool can help improve the way synthetic speech sounds, allowing for a more personalized audio output.

An "Auto SSML editor" is a tool that helps users create and customize Speech Synthesis Markup Language (SSML) content, which is used to control the speech output of text-to-speech applications. Here are some options for Auto SSML editors:

1. Woord's Online SSML Editor: This editor allows you to make speech sound more natural by using SSML tags. It has a whispering feature available for enhanced audio experiences. Woord SSML Editor

2. Optimizely's SSML Editor app: This app provides a standard way to enhance text content with SSML tags for synthetic speech generation. Optimizely SSML Editor

3. VoiceOverMaker.io's SSML Text to Speech Editor: This is a how-to guide on using their SSML editor, which is designed to help users automatically generate natural-sounding voices and voice-overs. VoiceOverMaker.io SSML Editor

4. VoiceComposer: An application for converting text and SSML text to speech, offering 800 voices for voice composition. VoiceComposer

5. Microsoft Azure's Customize voice and sound with SSML: This service allows you to specify the text-to-speech voice, language, name, style, and role for your speech output using SSML. Azure SSML

These tools can be very useful for developers and content creators looking to enhance the speech output of their applications with more natural and customizable voices.