Personally I use GNUScreen in addition to dwm, but mainly because I use a 15 years-old Celeron PC as a network console, which for some reason puts a one-two seconds tax on window creations. This setup is quite flexible, but you can get lost easily, in particular if in addition you use ctrl+Z carelessly.

An alternative is Emacs, which will give you shells and windows and splits and somewhat-interactive documents (org-mode) and has some support for images. If you're ready to sacrifice an hour per day to Emacs configuration for the next twelve years, it will do your biddings eventually...