Currently there are a lot of online services, most offer free limited or reduced services. Below are some of the serices we recommed.
Gmail is the most popular personal email service.
Watch the costs as you add domains and apps as these are no longer free.
The one area that Google has not covered is shared contacts. This is only availabe as a third party paid for addon.
GitHub git hosting (version control)
You can also host websites with GitHub Pages
Slack is a communications platform similar to Instant Messenger with the ability to use plugins.
Trello can be used as a project card wall for distributed teams.