There are many handyman software options available for starting an online service business. Here are a few popular ones:

Housecall Pro - This software is designed specifically for home service professionals and offers features such as appointment scheduling, online booking, estimates and invoices, dispatching, and more.

Jobber - Jobber offers features such as scheduling, dispatching, invoicing, and customer relationship management. It also offers integrations with other popular software tools like QuickBooks and Stripe.

ServiceTitan - This software is more geared towards larger service businesses and offers features such as customer relationship management, scheduling, dispatching, invoicing, and more.

Workiz - Workiz offers features such as online booking, job scheduling, estimates and invoicing, and dispatching. It also offers integrations with popular tools like QuickBooks and Zapier.

Ultimately, the best handyman software for your business depends on your specific needs and budget. It's important to research each option thoroughly and consider factors such as pricing, features, integrations, and customer support before making a decision.