I’ve just published a little package bundling a bunch of helpers for window management:

https://gitlab.com/ambrevar/emacs-windower

The commands deal with common operations that I miss in vanilla Emacs, such as

• switch to last buffer,
• toggle single window,
• toggle between horizontal/vertical split,
• move border more “naturally”,
• swap windows à-la windmove.

Simple, but some might find it useful enough and spare some 150 lines in their init.el 😉