Credits

SpaceHey uses some great open-source tools and libraries. Here are the Details:

lincanbin / White-HTML-Filter

A lightweight php-based HTML tag and attribute whitelist filter.
Link: https://github.com/lincanbin/White-HTML-Filter
Author: Canbin Lin
License: Apache License 2.0

necolas / normalize.css

A lightweight php-based HTML tag and attribute whitelist filter.
Link: https://github.com/necolas/normalize.css
Author: Nicolas Gallagher
License: MIT License

R74moji Emoji-set

A free pixel art-styled emoji set, containing over 1000 custom emojis.
Link: https://r74n.com/moji/
Author: R74n (R74n's Copy Paste Dump)
License: Creative Commons Attribution Share Alike 4.0

Silk Icons

A free icon set, containing over 700 16-by-16 pixel icons.
Link: http://www.famfamfam.com/lab/icons/silk/
Author: Mark James
License: Creative Commons Attribution 2.5

Farm-Fresh Icons

A free icon set, containing over 3000 16-by-16 pixel and 32-by-32 pixel icons.
Link: https://www.fatcow.com/free-icons
Author: FatCow
License: Creative Commons Attribution 3.0

Social Media Icons by Icondock

A free social-media icon set.
Link: https://icondock.com/free/vector-social-media-icons (archive.org version)
Author: Icondock.com
License: Icondock license (archive.org version)