Dropbox is an off-site server for file syncing, storage and sharing which allows users to save & share files of any format & access them anywhere, on any device.
Google Drive is a cloud storage and backup platform to access files, docs, photos & more, store them in a safe place, and collaborate with other people.
SlideShare is a community for sharing presentations. With 60 million monthly visitors and 130 million pageviews, it is amongst the most visited 200 websites in the world. Besides presentations, SlideShare also supports documents, PDFs, videos and webinars.
MailChimp gives you all the power of enterprise-level automation without any of the headaches. Provide timely, relevant information with MailChimp Workflows.
Quora connects you to everything you want to know about. Quora aims to be the easiest place to write new content and share content from the web. We organize people and their interests so you can find, collect and share the information most valuable to you.
Gmail is a free, advertising-supported email service offered as part of Google's G Suite, with 15GB of storage, color-coded inbox filters and unsend button.