The libagf project has been sitting on sourceforge for over two years now and I've witnessed a steady stream of downloads throughout that time. In spite of this I have yet see a single e-mail either asking for help, requesting bug fixes, thanking me or simply informing me of its use.
If you use this package in your work, please help spread the word by referencing either the website, the included documentation or the following paper:
Peter Mills 2009, "Isoline retrieval: An optimal method for validation of advected contours." Computers & Geosciences, in press (available online).