max-tabs package
Deprecated, use https://atom.io/packages/tidy-tabs instead.
I tend to leave tabs open, and editing many files, they pile up. This package closes oldest unvisited tabs. Keeping you at a defined maximum number of tabs.
You can configure maximum tab count. If you have multiple panes, number of tabs is devided by number of panes.
TODO: check if panes are vertically or horizontally splitted and make maxTabs number dependend on this.