QuickBase API

From their site: Intuit QuickBase lets you select ready-made online workgroup applications, customize them to suit your processes, and share them with your team. Applications available include project management, sales management, healthcare IT, HR and back office, IT, legal, marketing, process excellence, professional services, real estate, and SOX compliance. The QuickBase HTTP API gives Partners extensive control over QuickBase application operations, including the ability to programmatically create applications, add users, add, delete and modify records, and embed QuickBase tables into other Web sites.