GNU TeXmacs is a free scientific word processor and typesetting component of the GNU Project.
License: Open Source
Apps available for Mac OS X Windows Linux Xfce
Overleaf is a collection of real-time collaborative writing and publishing tools.
License: Freemium
Apps available for Online
TeXmacs is best suited for users who prefer offline work and customization, while Overleaf shines in collaborative environments and accessibility. Overleaf's cloud functionality contrasts with TeXmacs's desktop-centric approach.