coolpng

This server just serves an image with your IP on it

Credits:

3 (of many more) ways of writing text to image in go: https://gist.github.com/AndreKR/c373effad367a5e61871ecf495b80232

Terminus TTF Font
Source: http://files.ax86.net/terminus-ttf/
The license of Terminus TTF follows that of Terminus Font.

    Up to version 4.30 inclusive, the fonts were licensed under the GNU General Public License (version 2 or later).
    From version 4.32 onwards, the font license is the SIL Open Font License, version 1.1.
mkttf and others
mkttf is licensed under the BSD license. Other files you can get here may be published under other licenses.