Overleaf

• Online collaboration in LaTeX or RichText within one editing platform where you can easily switch between modes
• Real-time collaboration in your browser for sharing and editing projects with authorized users
• Unlimited number of invited collaborators (and link sharing) including external collaborators, with advanced access control for protected projects
• Preview documents as a PDF while writing
• Real-time track changes
• Full document history and versioning
• Advanced reference search
• Reference manager synchronization
• Dropbox synchronization