Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
Mailgun is an email automation service offering a complete cloud-based email service for sending, receiving & tracking email sent through user websites & apps.
Skype is a multi-channel communications software that provides video chat, voice calls, instant messaging & more to business of all sizes, across the world.
Salesforce.com, Inc. is an American cloud computing company headquartered in San Francisco, California. Though its revenue comes from a customer relationship management (CRM) product, Salesforce also sells commercial applications of social networking through acquisition and internal development.