• Carta - https://carta.com (has built-in 409A valuation)
• Foresight (template) - https://foresight.is/cap-table
• S3 cap table (template; prepopulated so you can model scenarios) - http://www.s3vc.com/resources/s3-venture-cap-table-template/
• CooleyGo (cap table form) - https://www.cooleygo.com/documents/sample-cap-table-pro-forma/