Nerdtool allows you to display many things directly on top of your desktop; weather reports, headline news, and system vitals are just a few uses.
Nerdtool is capable of displaying shell outputs with ANSI escaped formatting, but can also manipulate the final output's colors, size, and font. If more intricacy is desired, Nerdtool is also capable of displaying images, HTML documents, and other higher forms of media.
Shell support Image support (both local and online) Constant file monitoring Quartz file support Web support Customizeable font, color, and size Magnetic logs and other tools for layout assistance Accepts colored (ANSI escaped) shell output Full import/export
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Still works, but hasn't been updated in about ten years.