Foursquare[1], Twitter[2], LinkedIn[3] and The Guardian[4] use Scala.

If you are looking for code examples, you can explore here:

https://github.com/languages/Scala

I have been using Scala lately for some personal stuff and I've really fallen in love with it.

[1] - http://www.scala-lang.org/node/5130 [2] - http://www.artima.com/scalazine/articles/twitter_on_scala.ht... [3] - http://www.scala-lang.org/node/6436 [4] - http://www.scala-lang.org/node/7808

Novell developed Vibe in Scala: https://vibe.novell.com/

BankSimple is building on Scala: https://banksimple.com/

Nasa uses Scala in production: http://www.scala-lang.org/node/6605

Trust Metrics is being built primarily with Scala

We have been using Scala pretty heavily since 2008 at Capital IQ (capitaliq.com) and ClariFI (http://clarifi.com/) - check out this writeup - http://pchiusano.blogspot.com/2009/08/scala-success-story-co.... Since then we've only increased our usage and it's been working out extremely well.

SendOutCards, a Web to Print company uses Scala for their complete production printing backend and the generating of Card Data. We are even currently writing a Web Dashboard using Lift which will use our Scala CardPrinting API. https://www.sendoutcards.com

Remember The Milk, the online todo web application, uses Scala (http://www.rememberthemilk.com/).

Disclaimer: I work at Remember The Milk and I think Scala is a great fit for the problems we're solving.

All of our core services are being built in scala at bookish http://newsbreaks.infotoday.com/NewsBreaks/Bookish-Wants-to-...

afaik the Rapportive back end is built in scala.