What is the best family tree software available online that is free of charge?
Go with PAF from http://www.familysearch.org for starters. It’s free. When you want more bells and whistles, then you can check out all the free trial offers and find out which are more comfortable for your tastes. Whatever you do, keep the program on your machine, and not a proprietary a public server. The absolutely most important part of genealogy is that you learn the craft, tricks, and methodology. Software, like shoe boxes and filing cabinets, is just a tool. Learn to play with them all, then stick with what works for you. Pen and pencils and index cards are just fine. Expensive programs are just fine. Craftsmanship and human judgment are the crucial elements. Have a blast. I know I have.