Amos

Material icons - Google Design https://www.google.com/design/icons/

Primer - The CSS toolkit and guidelines that power GitHub. http://primercss.io/

GitHub Octicons https://octicons.github.com/

kanru

Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line. http://www.ledger-cli.org/

yjchen

Parse - Build powerful mobile apps faster with user management, push notifications, storage and analytics powered by Parse. https://parse.com/

irc.gitter.im https://irc.gitter.im/

$4

$ git format-patch –cover-letter

yan

Mattermost - an open source, self-hosted Slack-alternative http://www.mattermost.org/