There is no definitive answer to which is the best tool for automation business, as different tools may have different features, advantages, and limitations. However, based on the web search results that I have provided, some of the popular and widely used tools are:

• Zapier: This is a web-based platform that allows you to connect and automate various apps and services without coding. You can create workflows, called Zaps, that trigger actions based on events or conditions. You can also use pre-made templates or create your own custom Zaps.
• ActiveCampaign: This is a web-based platform that combines email marketing, marketing automation, and customer relationship management (CRM) in one integrated solution. You can create and send personalized emails, segment and nurture leads, automate sales processes, and track and optimize your campaigns.
• HubSpot: This is a web-based platform that offers a suite of tools for inbound marketing, sales, and customer service. You can create and manage content, generate and qualify leads, automate email and social media marketing, and provide support and feedback to your customers.
• SendinBlue: This is a web-based platform that offers email and SMS marketing, landing pages, and CRM features. You can create and send engaging emails and text messages, design and optimize landing pages, and manage and segment your contacts.
• EngageBay: This is a web-based platform that offers marketing automation, CRM, sales automation, and customer support features. You can create and run email campaigns, capture and nurture leads, automate sales tasks, and provide live chat and ticketing support to your customers.

These are just some of the examples of the tools that you can use to automate your business. You can also explore other tools that may suit your needs and preferences better.