There will be no new release of karma-mvc and karma-jcr anymore. It is not actively supported anymore. Please have a look at:
http://blog.inceedo.com/articles/2006/01/07/the-end-of-the-karma-framework

karma is a lightweight and simple to use j2ee open source (BSD) application framework intended for rapid application development. It
currently contains two components "common" and "jcr". The "common" component is the framework core and is based on the well known
model view controller (mvc) pattern.

Key features of karma "common":

Less xml description through convention over configuration approach (in fact a xml descriptor is optional)
Easy to test (mock objects are provided)
Easy to learn because it uses simple POJO actions, interceptors and filters
Less overhead and complexity
Less coding, quicker results
Less web-centricity and no container bindings
Autowiring of dependencies (spring framework integration)
Ajax capabilities

The "jcr" component is a simple API to persist Java Bean objects to a Java Content
Repository (JCR). Therefore it is an JCR Object Persistence Framework.

Key features of karma "jcr":

Multi domain repository layout
Integrated user management
No XML mapping
Out-of-the-box object persistence
Works with karma and other webapplication frameworks (spring framework integration)