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AND CO is a tool in the Time Tracking, Invoice Management and Billing And Invoicing categories.  

GetMyInvoices is a tool in the Billing And Invoicing and Accounting categories.  

Bookly is a tool in the Appointments Scheduling and Accounting categories.  

Zoho Subscriptions is a tool in the Payment Processing, Accounting and Recurring Payments categories.  

Paymo is a tool in the Project Management, Accounting and Task Management categories.  

Odoo is a tool in the CRM, ERP and Inventory Management categories. Odoo is an open source tool. You can find Odoo's open source repo on Github.  

Sellsy is a tool in the CRM, Invoice Management and Accounting categories.  

MoonClerk is a tool in the Payment Processing, Recurring Payments and Accounting categories.  

Invoice Ninja is a tool in the Time Tracking, Accounting and Billing And Invoicing categories.