Plotiar
Best for: novelists who want the family tree built into the same project as the manuscript and character notes.
In Plotiar a family tree is part of your writing project. You add parents, children, partners and siblings, mark a partnership as married, engaged, divorced or widowed, and show adoptive or step-parents. Six views show the family: Tree, Focus, Ancestors, Fan, Circle and Timeline, laid out top to bottom or left to right, or placed by hand. Each person can carry a portrait, dates in any format your world uses, a color and custom fields, and can link to any page in your project, such as a character sheet or a chapter. You can also add people straight from characters you already created in Lore.
Where it falls short: It is made for stories, not for real genealogy research, and the free plan holds five projects.