AwesomeTTS makes it easy for language-learners and other students to add speech to their personal Anki card decks.
This addon went through a period of being unmaintained in 2019/2020, as a result, a lot of forks appeared with different functionality. In 2020/06, we are doing a push to unify the code base. Service-specific pull requests should be approved quickly. We've implemented automated testing which should allow quickly validading code changes.
AwesomeTTS is free and open-source software. The add-on code that runs within Anki is released under the GNU GPL v3.