This software is made of three different components: DEiXTo GUI, a Windows only single executable portable program; DEiXToBot, "a Perl module implementing a flexible and efficient Mechanize agent (essentially a browser emulator)"; and the multi-platform DEiXTo CLE (Command Line Executor, available for both Windows and Linux), all released under a GPL v3 license.
I found DEiXTo GUI to be completely stealth, but be advised that it uses the system's Internet Explorer browsing engine...
[url]http://deixto.com/[/url] author wrote:DEiXTo (or ΔEiXTo) is a powerful web data extraction tool that is based on the W3C Document Object Model (DOM). It allows users to create highly accurate 'extraction rules' (wrappers) that describe what pieces of data to scrape from a website. DEiXTo can contend with a wide range of websites with high precision and recall. It provides the user with an arsenal of features aiming at the construction of well-engineered extraction rules. Wrappers built with GUI DEiXTo can be scheduled to run automatically providing automated access to resources of interest and saving users a lot of time, energy and repetitive effort.