FusionInvoice - Self hosted invoicing for freelancers and small businesses

Procurify - Reinvent the way organizations spend to make the purchasing process more accessible, manageable and convenient.

Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.

Precoro - Precoro is a robust procure-to-pay system for your business. Automated purchasing, simple sourcing and spend analytics — all in one easy-to-use platform!

Zervant - Easy invoicing, expense management, reporting, and customer feedback.

Conga Contracts - Conga Contracts is management solution designed to accelerate and simplify contract negotiations in Salesforce.