DocGen - Static website generator
Bill.com - Bill.com provides ACH payments processing, automates your accounts payable and accounts receivable processes.
openSourceCM - Web-based legal document processing and contract management
AvidXchange - Liberate Your AP
LogicalDOC - A document management system such as LogicalDOC can help your organization better manage business processes and put order in the chaos of documents every day run your business.
Stampli - Interactive Invoice Management. Instant Relief for AP.