Chrome: Trello is a fantastic tool to organise your whole life, and before you know it, you'll have a long list of boards in this visual organiser. Boards for Trello gives you quick access to these through a little extension icon.
The list has starred boards, your own boards, as well as any team boards you are a part of. Scroll through the list or use the handy search. To view cards, click the board to open it in a new tab. The extension also has a shortcut to your notifications, showing the unread count.
The free version is limited to these features, but the $US5 Pro version offers much more for power users. You can view notifications without opening a new tab, star/unstar boards, hide organisations, and turn your New Tab page into a tiled view of all your boards.
If you regularly use Trello as a flexible, visual organiser, the $US5 would actually be worth it. If not, the free version is good enough to remind you to check the app and quickly access your boards, saving a few clicks every time.