Ant Renamer is a free (really free, i.e. the source code is available) program that makes easier the renaming of lots of files and folders by using specified settings.
Pulno is a website audit tool which checks for SEO related issues and sends comprehensible tips to improve on-page SEO with page speed optimizer (CSS and image file optimization), meta tags and unique text analyzer.
ksbooster Script is a tool to analyze websites to find weaknesses related to competition and make a suggestions to improve your website rankings. It also has a module for analysis of technologies used on the website.