Ulm University has written a number of improvements, enhancements and bug fixes for JiST/SWANS.
In addition, there is the DUCKS execution framework, which allows you as a user to run many simulations in parallel on different servers and different parameters. It also provides functionality to interact with (for example) a database server to store simulation results.
A short summary can be found below:

JiST/SWANS Improvements

• Bugfixes
• Java 1.5 support (with up to 40% performance increase)
• Implementation completion

JiST/SWANS Enhancements

• Provides new schedulers for JiST
• Provides a new interface queue implementation which can drop packets in case the queue is full
• Provides new mobility model to replay ns-2 mobility files
• Provides a set of improved Map and Properties implementations
• Provides some new applications

DUCKS Execution Framework

• Provides a generic driver that builds simulations specified in configuration files
• Provides a controller that is capable of running a complete simulation study on multiple JiST servers running within the network
• Defines a structured way of collecting simulation results
• Can store simulation results e.g. on a database server

Geographic routing

• Geographic addressing
• Geographic forwarding: Geounicast, Geobroadcast, Geoanycast