This wiki tracks the applications written (or being ported to run) on top of YARN i.e. Next Generation Hadoop processing framework aka NextGenMapReduce.
Apache Hadoop MapReduce, of course! - https://issues.apache.org/jira/browse/MAPREDUCE-279
Apache HAMA - https://issues.apache.org/jira/browse/HAMA-431
Apache Giraph - https://issues.apache.org/jira/browse/GIRAPH-13
Open MPI - https://issues.apache.org/jira/browse/MAPREDUCE-2911
Generic Co-Processors for Apache HBase - https://issues.apache.org/jira/browse/HBASE-4047
Other ideas:
Apache HBase deployment using YARN - https://issues.apache.org/jira/browse/HBASE-4329
We encourage you to add your application if you are using NextGenMapReduce to build a new processing framework or tool.