What's your favorite tool for remote team collaboration?

Whether you work remotely from across town or across the globe, collaboration tools are the key to getting things done with the rest of your team. Which tools are your favorite? Here are some of ours.

• Team chat tools, like IRC or a more modern alternative, allow for real-time communication and sometimes allow for faster resolution to discussions than more asynchronous tools. An occasional video chat can bring even more expressiveness to the conversation.
• Document collaboration tools, whether something as simple as a wiki or an Etherpad, or something closer to an office suite replacement, can allow for faster and more collaborative editing.
• Project planning tools, whether a simple kanban board or a full project management tool, help to keep everyone on the same page.
• A file sharing tool, whether something versioned like a Git repository or something simpler like ownCloud or Nextcloud keeps everyone synced on the same files.
• And of course, old fashioned email isn't going anywhere anytime soon.

Or maybe your favorite tool is something else entirely? Let us know in the comments below.