I've seen similar questions to this but I want to articulate that my request is to view multiple boards at the same time.
This would be a common requirement for a product owner or manager who needs to see multiple workflows.
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I have released an Open Source project on Github for exactly this use case: https://github.com/natterstefan/react-trello-multiboard.
React-Trello-Multiboard is a single-page application built with React displaying multiple cards of several Trello boards and lists. The cards and lists can be filtered by preferred team members and/or "sprints" (or weeks, however you call it). Visit the GitHub page for more details and a list of features.
You can find a live example here: https://multiboardfortrello.com/.