png2linetext is described as 'Transform PNG to textual line art in the terminal'. There are four alternatives to png2linetext for Linux, Mac, Windows and Xfce. The best alternative is Libcaca, which is both free and Open Source. Other great apps like png2linetext are textview (Free, Open Source), hiptext (Free, Open Source) and derasterize (Free).
Quickly view (satellite) imagery directly in your terminal using Unicode 9.0 characters and true color. textview is a small tool to quickly view high-resolution multi-band imagery directly in your terminal.
derasterize converts pictures into Unicode text with Ansi colors for display within a terminal. It performs lots of AVX2 optimized math to deliver the best quality on modern terminals with 24-bit color support, e.g. Kitty, Gnome Terminal, CMD.EXE, mintty, mlterm, etc.