Free and open source bridge between Java and Ruby
Free multi-platformed Java JNI interface
FUSE-J project contains Java bindings for FUSE (Filesystem in USErspace).
Software development kit for working with native code from any Java application without using Java Native Interface (JNI) technology. You can call functions from any dynamic library or use system API without necessity to waste time on studying JNI.
Java library for interfacing to external functions written in any programming language. Surpasses JNI in ease of use and other aspects. Ideal solution for reuse of legacy code and non-Java third party libraries.