There are already lots of Trello clones:

Restyaboard: http://restya.com/board (open source, self-hosted)

Phabricator Projects https://www.phacility.com/phabricator/projects/ (open source, self-hosted, or paid hosting)

Kanban: https://kanboard.net/ (open source, self-hosted, or paid hosting)

Wekan: https://wekan.io/ (open source, self-hosted)

And no doubt, lots more not listed here...