Text2Speech
Uses Google Translate service
Requires you to install cURL on your server
Stores Google Translate audio files on your server
Does not support long texts, the plugin will work for texts under 100 characters
Shortcodes can include language directive
Autoplay
Tags: audio, google translate, Google Voice, speech, text to audio, text-to-speech, text2speech, voice
https://wordpress.org/plugins/text-2-speech/
Text To Speech
This plugin hasn’t been updated in over 3 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
Only supported as a pre-defined Widget of text.
Based on eSpeak code
Supports 1 (one) language, Romanian
Tags: espeak, javascript, Speak, speech, text, text-to-speech, widget
https://wordpress.org/plugins/text-to-speech/
Accessibility (a11y) Speech Synthesis
This is useful for development to simulate what a user experiences when using a screen reader.
Tags: a11y, speech, tts
https://wordpress.org/plugins/a11y-speech-synthesis/
GSpeech
Uses Google Translate service
Requires you to install cURL on your server
Listen to selected text feature didn’t work in our testing
Limited to 1 spoken text block – to remove purchase pro version $78/year for 1 domain
GSpeech backlink will be visible – to remove purchase pro version $78/year for 1 domain
Speaking menus
Welcome message
Autoplay
Tags: accessibility, admin, AJAX, arabic, Attachment, buddypress, button, category, chinese, comment, comments, contact, contact us, contacts, content, copy, CSS, css3, email, english, Facebook, feed, feedback, form, french, german, google, google translate, greetings, hebrew, html, html5, iPad, iphone, italian, javascript, jquery, link, links, media, mobile, multilingual, network, page, pages, plugin, plugins, portuguese, Post, posts, readability, request, rss, Russian, secure, send, seo, shortcode, sidebar, simple, social, society, sound, spanish, stats, tablet, text, text-to-speech, tts, widget, wordpress
https://wordpress.org/plugins/gspeech/
Amazon IVONA iWebReader
This plugin hasn’t been updated in over 3 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
This plugin requires a Service ID (API key) to operate, the site no longer provides these so this plugin can no longer be used.
https://wordpress.org/plugins/ivona-webreader/
TTS Engine Post to Speech
This service was retired in 2013 and is no longer operational.
TTSengine.com now seems to be Voysis
This plugin hasn’t been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
Tags: speech synthesis, text 2 speech, text to speach, text to speak, text to talk, text-to-speech, tts, tts voices, txt to speech, type to speech
iSpeech Listen Button
http://www.ispeech.org/integration/wordpress
TINGWO
http://www.tingwo.co/en/plugin-for-wordpress
VOZME
http://vozme.com/webmasters.php?lang=en
VOCALYZE WIDGET
[Discontinued] This plugin hasn’t been updated in over 4 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
https://wordpress.org/plugins/vocalyze/
SoundGecko
This plugin hasn’t been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.. This company behind this plugin has been discontinued
Tags: button, listen, Post, Share, sharing, widget
https://wordpress.org/plugins/listen-button-powered-by-soundgeckocom/
sds_Talkr_Plugin
Discontinued 2008
Tags: podcast, talkr
https://wordpress.org/plugins/sds-talkr/
SitePal Talking Avatar 1.8
This plugin hasn’t been updated in over 6 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
Tags: Avatar, sitepal
https://wordpress.org/plugins/sitepal-talking-avatar/
SpeakPress
Discontinued 2010. This plugin hasn’t been updated in over 5 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
Tags: audio, read, SpeakR, streaming, tts
https://wordpress.org/plugins/speakpress/
Odiogo Listen Button
Discontinued 2010. This plugin hasn’t been updated in over 5 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
Tags: accessibility, audio, feeds, mp3, podcast, rss, text-to-speech
https://wordpress.org/plugins/listenbutton/
Speeka
TalkingText
Discontinued 2008
Tags: text-to-speech,mp3,audio,read,speech,conversion
http://www.talkingtext.com
ResponsiveVoice Text To Speech
ResponsiveVoice Text To Speech is a HTML5-based speech synthesis library designed to add voice features to WordPress across all smartphone, tablet and desktop devices. It supports 51 languages through 168 voices and has no dependencies.
https://wordpress.org/plugins/responsivevoice-text-to-speech/