Scaladin (formerly known as scala-wrappers) tries to make easier to use Vaadin Framework with Scala programming language. The JAR file and a Maven dependency can be found from the Vaadin Directory.
Take a look at the wiki.
Scaladin is developed by Risto Yrjänä and Henri Kerola. Also, thanks to Henri Muurimaa for great ideas and feedback!
Scaladin is licensed under the Apache 2.0 License.
Wiki has a page about Developing the Library.