Cyndi's List of Genealogy Resources on the Internet: A large categorized and cross-referenced directory of sites useful for genealogical research, with hundreds of thousands of links

Gramps: Genealogical Research and Analysis Management Programming System, is free, open source, genealogy software. Gramps is programmed in Python using PyGTK. Available for Windows, Linux, BSD, Solaris, Mac OS X

Heraldica: FAQs, introductions to heraldic concepts and terms, an illustrated glossary and information on heraldry within various countries and groups