How these screenshots were obtained
alttab is X11 window switcher designed for minimalistic window managers or standalone X11 session.
alttab [-w N] [-d N] [-sc N] [-mk <str>] [-kk <str>] [-bk <str>] [-pk <str>] [-nk <str>] [-ck <str>] [-mm <N>] [-bm <N>] [-t NxM] [-i NxM] [-vp str] [-p str] [-s N] [-theme name] [-bg color] [-fg color] [-frame color] [-font name] [-v|-vv]
(see man page for details)
Unlike task switchers integrated in most simple window managers (WM) or dmenu-like switchers, alttab features visual interface and convenient tactile behaviour: press modifier (Alt) - multiple switch with a key (Tab) - release modifier. Also, it's lightweight and depends only on basic X11 libs, conforming to the usage of lightweight WM.
git clone https://github.com/sagb/alttab.git cd alttab ./configure && sudo make install
Usually it should run fully functional without any argument:
no-wm: use X11 without a window manager
alttab (C) Alexander Kulak <sa-dev AT odd POINT systems> 2016-2021