It depends on what your definition of
free is, but you night want to checkout the DaCapo benchmarks (http://osl-www.cs.umass.edu/DaCapo/gcbm.html).
The main obligation of the license is that if you use the benchmarks you
need to cite them correctly and report the version number of the benchmark
suite.
These also have the advantage of almost
all running on Jikes RVM + classpath (the exceptions are due to incomplete
AWT support in classpath).