Tripwire is a very popular file integrity checker which saves checksums of selected files in a database. Any changes to these files are flagged and logged, including those that were added or deleted, with optional email / pager reporting. Databases and reports are cryptographically signed.
You can download it from the following link: https://packetstormsecurity.com/files/download/23449/tripwire-2.3-47.bin.tar.gz
Source: https://packetstormsecurity.com/files/23449/tripwire-2.3-47.bin.tar.gz.html