Wave is a free accounting tool with no usage limits that offers features such as sending unlimited professional, branded invoices to clients, processing payments, running payroll, and generating custom reports. It can also be paired with automation tools like Zapier to connect with other apps and automate tasks, such as consolidating sales records, adding customers to email lists, and creating backups automatically. With Wave and Zapier, users can automate workflows to streamline their finances, reduce busywork, and improve productivity.