cloc counts blank lines, comment lines, and physical lines of source code in many programming languages.

MySQLTuner is a script written in Perl that will assist you with your MySQL configuration and make recommendations for increased performance and stability.

Tools for Linux/Unix sysadmins.

PostgreSQL Cluster performances monitoring and auditing tool

KH Coder: for Quantitative Content Analysis or Text Mining

Fancy command-line utilities for OpenResty

Universal Romanizer that can convert any unicode script to roman (latin) script

colorgcc is a perl script to colorize gcc output. I'm collecting random patches and changes

A tool and a language that help generating random complex database instance based on predefined rules

fail-safe management tools for network-based software RAID, using mdadm + iSCSI