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Libre (free, open source) software is one of the paradigmatic cases where heavy use of telematic tools and user-driven software development are key points. This paper proposes a methodology for measuring and analyzing remotely big libre software projects using publicly-available data from their version control repositories. By means of a tool called CVSAnalY that has been implemented following this methodology, measurements and analyses can be made in an automatic and non-intrusive way, providing real-time and historical data about the project and its contributors.