Accordion (GitHub: mattboehm / vim-accordion, License: Vim) is a Vim window manager that automatically shrinks vertical split windows so you can focus on the active window. It's by the same author as Unstack and can be used with Unstack to show stack traces in vertically split windows.
VerticalHelp by Mel Davis is a plugin that makes help open in vertical splits. This may work better for you if you use a widescreen monitor. It functions just like the standard help command,
:help, and can be run by typing