jquery.fancytree/demo/ajax-tree-taxonomy.json

Fancytree is a JavaScript tree view plugin for jQuery with support for persistence, keyboard, checkboxes, drag'n'drop, and lazy loading.

[
	{"title": "Animalia", "expanded": true, "folder": true, "children": [
		{"title": "Chordate", "folder": true, "children": [
			{"title": "Mammal", "children": [
				{"title": "Primate", "children": [
					{"title": "Primate", "children": [
					]},
					{"title": "Carnivora", "children": [
					]}
				]},
				{"title": "Carnivora", "children": [
					{"title": "Felidae", "lazy": true}
				]}
			]}
		]},
		{"title": "Arthropoda", "expanded": true, "folder": true, "children": [
			{"title": "Insect", "children": [
				{"title": "Diptera", "lazy": true}
			]}
		]}
	]}
]