REIL was initially developed by Zynamics as part of their BinNavi framework, proprietary code analysis software written in Java. However, after Zynamics was acquired by Google they abandoned BinNavi, so, I decided to develop my own implementation of REIL.
more here..........https://github.com/Cr4sh/openreil
more here..........https://github.com/Cr4sh/openreil