Donated to Apache in 2018. https://blog.twitter.com/engineering/en_us/topics/open-source/2018/heron-donated-to-apache-software-foundation https://blog.twitter.c

Donated to Apache in 2018. https://blog.twitter.com/engineering/en_us/topics/open-source/2018/heron-donated-to-apache-software-foundation https://blog.twitter.com/engineering/en_us/topics/open-sourc... (and open-sourced in 2016, having started development in 2014).