Smart Wizard is a flexible and heavily customizable jQuery step wizard plugin with Bootstrap support. It is easy to implement and gives a neat and stylish interface for your forms, checkout screen, registration steps etc.
jQuery-steps is a lightweight yet customizable jQuery plugin that converts any grouped elements into a step-by-step wizard with navigation buttons and callback functions.
It is easy to integrate other plugins e.g. jQuery validation plugin to create a wizard driven form with field validation.
jQuery Tree plugin allows you to create tree structure using Bootstrap or Material Design styles. Free open source plugin distributed under MIT License.