You can easily share any type of file to anyone (photos, docs, links) and it integrates directly into Slack, HipChat, Basecamp, Trello, Jira, and Flowdock. I use it to automatically schedule meetings, share my calendar with clients, send meeting invites, and get notified when people respond to my messages. It even has a free version for personal use. If you want to get serious about managing your business calendar, this is the tool for you.