Mosaic helps you find designs. It only runs on Mac OS.
brew install npm imagemagick --build-from-source
sudo yum install sqlite-devel
git clone -o upstream https://github.com/tdooner/mosaic.git
cd mosaic
npm install
webpack app/components -p
wget http://sketchtool.bohemiancoding.com/sketchtool-latest.zip
unzip sketchtool-latest.zip -d vendor
bundle install
bundle exec ruby app.rb
You will need to go through some more setup steps (e.g. setting up a Dropbox app) once you get the application itself running, but it will walk you through it!
Once you have everything set up, you can access the Mosaic server locally at
http://localhost:4567.