I am using LyX, an open-source free LaTeX based word processor. I find it easier to use compared to Overleaf, though the two are quite different products. Some of the advantages are:
Desktop app that does not depend on network connection.
Advanced Word-like features: spell checking as you type, multiple user "track changes" option, compare documents option etc.
Easy menus to define all document's properties (margins, text size, line spacing etc.)
WYSIWYG
LaTeX commands work in the math environment (e.g. \alpha, \frac) - good if you already know some LaTeX and faster than keyboard shortcuts (but if you prefer, fully programmable shortcuts are there)
Works with the standard LaTeX distribution that you already have installed (e.g. MikTeX) so does not take huge disk space.
Multi platform (Windows, Mac OS, Linux, etc.).
It's free.
Periodical updates with bug fixes and new features.
I am using JabRef, a Java-based open-source (and free) bibliography manager to organize my references and create automatic bibliographies with BibTeX. It has many features (I do not use most of them), and I highly recommend it for anyone that uses BibTeX.
During the academic years 2012-2013, Ilan Kremer and me organized a reading group about Information Economics and Finance in the Hebrew University's Rationality Center.