abduco + dvtm vs mtm

Contains less code. Does not have to be backwards compatible. Two separate tools, each doing its job: session management may be used separately from tiling window/pane management.

There are the 13 shortcuts that let you accomplish the vast majority of what you'll ever need (Mod is ctrl-g by default):

Window manipulation:
Mod-c to create a window, Mod-l/h to adjust window size, Mod-j/k to change window, Mod-n to select nth window in view, Mod-enter to swap with master window, Mod-space to change layout.

Tagging:
Mod-t n to tag a window with the nth tag (1..5), Mod-T n to add/remove tag n to/from the window, Mod-v to view all windows with tag n, Mod-V to add/remove all windows with tag n to/from view, Mod-0 to view all windows.

There are three commands (change focus, split, close). There are no modes, no dozens of commands, no crazy feature list.

mtm emulates a classic ANSI text terminal. That means it should work out of the box on essentially all terminfo/termcap-based systems (even pretty old ones), without needing to install a new termcap entry.

mtm is small. The entire project is around 1000 lines of code.

mtm is "finished" as it is now. You don't need to worry about it changing on you unexpectedly.