Visual Studio Online is now Visual Studio Team Services. And you can connect with Xcode, Eclipse, IntelliJ, Visual Studio, or your favorite development tool.
Not only do you get free, unlimited, private Git or TFVC repos under version control, but also integrated bug and work item tracking with enterprise Agile tools for DevOps, like backlogs and Kanban boards plus automation for your builds, tests, and releases too.
Your first 5 users are free with unlimited Visual Studio subscribers and stakeholders at no extra charge. Here's more about how to get started with Team Services.