Harmoni is a featured packed WordPress theme, that is meant be used as a parent when developing. Every option available is completely opt-in, making sure your site build isn't getting flooded with unnecessary performance bottlenecks.

Besides, a healthy dose of practical PHP helpers, there are various Twig add-ons available to make life easier using Upstatements Timber .

Please keep in mind that there will be breaking changes occurring until 1.0 has been reached.