Integrate with Gmail and Inbox
Allow your app to send emails that expose interactions in Gmail, Inbox, Google Search, and Google Now.
Use the Gmail API to add Gmail features to your app. RESTful access to threads, messages, labels, drafts and history. Easy to use from modern web languages.
Gadgets are a way to add your app into the Gmail web interface in the sidebar.
Connect your alternative email client with Gmail user accounts, using industry standard IMAP and SMTP protocols.