Xero can automate business tasks, including getting up-to-date financials, cash flow, and expenses. Pricing ranges from $9 to $60 per month.
Square Payroll is a full-service payroll software that allows you to pay contractors and full-time employees. Pricing starts at $5/contractor/month.
Zoho CRM allows users to manage their contacts and automate their email marketing and lead generation tasks. Prices range from $0 to $55/user/month.
PayPal Business is an online invoicing & payment processing services provider. Rates start at 2.9% + $0.30/transaction.