No matter how big or small your coalition is, communication is key. We highly recommend utilizing free communication tools like Gmail for emailing and calendar features. Additionally, Google Drive is free (up to 15GB per user), allows for easy sharing of folders and documents, includes version history, and enables collaboration in real time.
If necessary, you could also upgrade to services like Microsoft OneDrive, Dropbox, or G Suite. When making a choice, consider what platform is likely to work for all of your team members (including those you haven’t yet recruited) and provides the features you need. The most important thing is to make sure documents are being saved in a consistent location that can be shared or transferred if the role switches hands in the coalition.