Yo, ACM officers add stuff here:
- HTML/CSS/Javascript/Jquery
- Django
- Nodejs
- Hadoop
- Grails
- Rails (yes, I know how the vast majority of us feel about this)
- Python + NLTK
- Python + numpy/scikit/the whole bizarre set of machine learning frameworks that have decided to colonize python
- Backbone or Angular or Ember
- Javascript + D3
- Racket (and I don't mean this kiddy league BSL stuff they teach you in Fundies)
- Elasticsearch or MongoDB or some other NOSQL database