There are hundreds of tried, true, and tested development stacks. Our favourites include:

Coding

Python, Swift, UnityScript, Objective-C, C/C++, Ruby, Java

For the web

Pyramid, Django, TurboGears, Node, Javascript/JQuery, CoffeeScript, SASS, PHP

Apps and machine rooms and devices

iOS & MacOSX, Android, Unity3D, Kivy, Qt/PyQt, Roku, LG SmartTV, Chef, Puppet, Juju

Using databases and stores

PostgreSQL, SQLServer, CouchDB, Riak, Redis, Google Datastore, with SQL, PL/pgSQL, TransactSQL, GQL

In the clouds

Heroku, Amazon Web Services, Google App Engine, Internap, Akamai, SquareSpace, Wordpress

With the usual suspects 

Pyaella, PostGIS, GEOS, YAML, reStructuredText, Markdown, Creole, MediaWiki, LaTeX, XMPP, AtomRSS/mRSS/GeoRSS, RDF, OWL