StrEatFoodie is the best and only menu bar application for the SoMa StrEat Food Park. It works by listening to StrEat Food's Twitter (https://twitter.com/somastreatfood), deciding which tweets announce the presence of trucks at the park, fetching information about the announced trucks and displaying the trucks in the menu bar.
StrEatFoodie is free and open source, and the source code is hosted at https://github.com/jimmyoneill/StrEatFoodie.