https://tz-dev.github.io/hl_text2speech/index.html
Tested in FF only.
Features:
- Autocomplete functionality
- Vocabulary can be added to textarea by left-click
- Vocabulary can be previewed by right-click
- Volume Slider
- Speaker selection (6)
Speakers and vocabulary:
- Black Mesa Announcement System (600+)
- H.E.V. Assistant (130+)
- Barney (170+)
- Combine Police (100+)
- Scientist (250+)
- Soldier (350+)