Packaging for Open Source Tripwire is maintained by various third parties:

 * RPM (Fedora): http://pkgs.fedoraproject.org/cgit/rpms/tripwire.git/
 
 * RPM (OpenSuSE): https://build.opensuse.org/package/show/security/tripwire

 * RPM (AIX): http://www.perzl.org/aix/index.php?n=Main.Tripwire 

 * Debian: https://tracker.debian.org/pkg/tripwire

 * Gentoo: https://packages.gentoo.org/packages/app-admin/tripwire
    Gentoo also has an SELinux policy for OST:
    https://packages.gentoo.org/packages/sec-policy/selinux-tripwire

 * Chef cookbook: https://github.com/rackspace-cookbooks/rackspace_tripwire

 * FreeBSD Ports: http://svnweb.freebsd.org/ports/head/security/tripwire/

 * FreshPorts (BSD): http://www.freshports.org/security/tripwire

 * MacPorts: https://trac.macports.org/browser/trunk/dports/security/tripwire

 * NetBSD pkgsrc: http://ftp.netbsd.org/pub/pkgsrc/current/pkgsrc/security/tripwire/README.html
    NOTE: At present (April 2016) pkgsrc only provides the obsolete Tripwire 1.2, from the mid-1990s.
    That version lacks contemporary hash algorithms, and you probably don't want to use it.