GMT quick references
GMT -Generic Mapping Tools

Harvard LaTeX manual
Wikibooks LaTeX manual
UC Davis How to Do This and That with LaTeX
LaTeX Cookbook

SAC Tutorial Guide for new users - Seismic Analysis Codes (modified)
Full SAC manual
SAC homepage - Seismic Analysis Codes

SEISAN - Earthquake Analysis Software

Simple Spreadsheet Manual

Proofreaders' Marks
SpecSEM3D_Globe