The latest versions of the gadgets can be found on http://www.teamcity-gadget.com/
In order to build TeamCity Gadget, you need to have Node.js/npm and git installed.
Clone a copy of the main git repo by running:
git clone git://github.com/anisimovsergey/teamcity-gadget.git
Run the build script:
npm run build
The built version of TeamCity Gadget will be put in the dist/
subdirectory.