You could have downloaded Trello X 1.0 for Mac from our software library for free. The software lies within Productivity Tools, more precisely Office Tools. This free software for Mac OS X was originally developed by LingsDesigns.
From the developer:
Trello X can create boards to organize anything you’re working on. You can write your ideas down on Trello cards and arrange them in lists on your boards. You may add details to your cards, such as checklists to keep track of to-dos, comments to update your co-workers, photos, videos, and PDFs. In addition, everything you do is synced and saved instantly to the cloud, so that all your devices are always up to date.
You may want to check out more Mac applications, such as QuickTab for Trello, App List for Trello or Quick for Trello, which might be related to Trello X.
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