Here are some Grunt plugins for Tizen Applications that are available from github and are released under the Apache v2 license:
grunt-tizen: For pushing packages (or other files) to a Tizen device, installing/uninstalling them, and starting/stopping applications (via sdb).
grunt-zipup: For creating zip files with customisable, template-based filenames; as Tizen web apps are just zip files with a wgt suffix, it can also be used to create those.
grunt-mochaccino: For running mocha tests within a grunt build, using the mocha command line rather than the mocha API. This was developed for unit testing the above plugins, but can be used to run mocha tests for any project.