Boards
Trello
Anchor Dates and Retainer Meter are not in the public Trello directory yet. The pages say so. The privacy policies describe the intended practice: board data stays in Trello, and Zecro does not keep a separate copy.
Independent of Trello and Atlassian.
No public apps yet
Nothing from Zecro is listed for Trello today. The directory of what is shipping is on the apps page.