If you are developing an exciting piece of software with Scala, tell us a bit about it.

Note: Unless noted otherwise, do not expect these projects are in release-worthy or supported state.

• It uses Scala mixins aggressively to structure the system: shared data is “mixed-in” the various classes that require access to it.
• The main data structure of a compiler (the syntax tree) is often difficult to access. Case classes and pattern matching made traversing the tree intuitive and straightforward.
• Higher-order functions proved extremely useful to iterate over the many complex lists that are found everywhere in the compiler.
• Scalac 2 is roughly 44’000 lines of code. The older and lesser compiler (Scalac 1) was 73’000 lines of Java. A large part of the improvement is certainly due to using Scala instead of Java.

• Aladdin is the Scala bugtracking system, used by both LAMP staff (10 people) and netwide Scala community.
• It was originally built with Java and Struts and saw gradual replacement of Java Code with Scala code
• XML literals were quite useful in lessen the dependence on Struts. In turn, Aladdin was quite useful for debugging XML literals.

• Implements actor abstractions as a domain specific language (DSL) in Scala.
• High performance through event-based computation. Actors are much more lightweight than VM threads.
• Relies heavily on lightweight closures, partial functions and pattern matching of Scala.
• Provides very pleasing syntax (close to Erlang) even though it is implemented entirely as a library.
• Supports arbitrary blocking operations without inversion of control.
• Lightweight pickler combinators available for mobile JVMs (such as KVM) without reflection support (besides standard Java serialization).
• Distributed operation over TCP and JXTA.
• Available on the Scala Bazaar in package scalaactors.
• See project home page.

• DDP is a new kind of program analysis that allows trading speed for precision at a fine-grained level; each information goal of an analysis run can be pursued with a different level of vigor.
• See the project home page.

• An in-house intranet application that allows 5000 employees in the company to do their holiday requests, and have them approved; eliminating 40.000 paper requests a year.
• domain layer is written in Java
• the webpages are simple jsp
• the workflow logic is done in Scala
• originally written in Scala 1.3, now ported to 2.1.5
• the functional aspects of Scala made this a joy to build

• A package-distribution system for managing software components developed by independent work groups.
• The approach is based on package universes.
• See the home page.