Texmaker version 4.2 has been ported (7/24/2014) to OS/2. This Qt4 app is a LaTeX editor.

Texmaker is a free, modern and cross-platform LaTeX editor for os2 systems that integrates many tools needed to develop documents with LaTeX, in just one application.
Qt Ports Page: http://svn.netlabs.org/qtapps/wiki/QT4%20Office
Project URL: http://www.xm1math.net/texmaker/index.html
Port by Elbert Pol.
Source: OS/2 Warp News and Rumors