Cronofy - Unified Calendar API for developers
Boomi - The #1 Integration Cloud - Build Integrations anytime, anywhere with no coding required using Dell Boomi's industry leading iPaaS platform.
Calendarix - Calendarix is a powerful and easy to use web-based calendar that runs on PHP and MySQL.
SAP NetWeaver - SAP NetWeaver enables the composition, provisioning, and management of applications across a heterogeneous software environment
Campaign Calendar - Campaign Calendar by Bracket Labs builds a marketing calendar from your Salesforce Campaigns.
Pimcore - Pimcore is an award-winning data management and customer experience management software.