https://roundcube.net/
https://roundcube.net/download/

https://github.com/roundcube/roundcubemail

https://roundcube.net/screens/

2023
https://nextcloud.com/blog/open-source-email-pioneer-roundcube-comes-aboard-nextcloud/
https://www.opennet.ru/opennews/art.shtml?num=60197