The latest version of X-ISP is 2.6p1. The RPMs were built under RedHat 6.0, using egcs-1.1.2-12 on a P133.
xisp-2.6p1-1.i386.rpm xisp-2.6p1-1.src.rpm
Older versions of X-ISP that have been built by me as RPMs:
xisp-2.5p4-1.i386.rpm xisp-2.5p4-1.src.rpm