Another option is the TrelloExport Chrome extension:
You may run into a situation where you need to use Trello’s JSON export to locate a piece of information. To do this, we suggest reaching out to a developer—JSON, particularly when it’s covering a whole board, can be complicated to parse out correctly. If a developer isn’t available, you may want to try using an online JSON-to-CSV converter, such as: (This converts to XLS, not CSV)

via Making sense of Trello’s JSON export – Trello Help


Configuring your firewall for Trello
You can configure your firewall to allow Trello as a trusted source by following these guidelines. Because Trello’s IP addresses can change frequently and without notice, we’d suggest that you use our site’s domain names instead of a particular site IP address.

First, please configure host names to recognize any sub-domain of:

* (paid accounts only)

In addition, these are the domains for the external resources for Trello: + (for SSO (paid accounts only)) (for dropbox attachments) (for attachments) (for one drive attachments)

via Configuring your firewall for Trello – Trello Help

Trello offers three paid options: Trello Gold, Trello Business Class, and Trello Enterprise. They’re ways to build on to the free Trello experience—Trello Gold offers a way for individual users to take their Trello use to the next level, Trello Business Class is intended for multi-user teams to have more fine-grained control over who can access their boards, and Trello Enterprise allows for concierge support as well as additional security features important for large-scale enterprise teams.

via Trello Enterprise vs. Trello Business Class vs. Trello Gold – Trello Help