Cowboy
Integrates Gnome Shell with Remember the Milk.
Install
You can install Cowboy extension in 2 ways.
Install from extensions web page
Open in firefox https://extensions.gnome.org/extension/753/cowboy and enable the extension.
Clone from github
git clone https://github.com/kazjote/cowboy.git
mkdir -p $HOME/.local/share/gnome-shell/extensions
ln -s $PWD/cowboy $HOME/.local/share/gnome-shell/extensions/cowboy@kazjote.eu
Development
You can use cowboy_release script to prepare zip package that can be submitted to extensions.gnome.org.