Below you can find several free tools.
TheWebMiner Filter it's an important tool for market research. Basically it's like a search engine with a higher focus on filtering not on sorting.You can start a market research right now.
Get By Sample
Extract structured data by sample. This is a magic tool which learns from you and gives you back desired data in a beautiful format. Go!
This is a Google Chrome extension which generates sitemap.xml for your website. All you need to do is click "Generate!" button in extension window and wait until a Save As dialog appears.Install link: TheWebMiner Sitemap Generator
Regex to Vim
Convert regex to Vim expressions. If you want to use Regex in Vim, this is a perfect tool. Go!
If you want know when a price of a specific product is changing at a specific online store, this is what you need.