Software and Tutorials:

GIS:

http://www.esri.com/software/arcgis/
http://qgis.org/en/site/
http://hexagongeospatial.com/products/gis
http://www.mapinfo.com/product/mapinfo-professional/

Remote Sensing:

http://exelisvis.com/ProductsServices/ENVIProducts/ENVI.aspx
http://www.hexagongeospatial.com/products/remote-sensing/erdas-imagine/overview

Image Processing:

http://www.agisoft.com/
https://pix4d.com/
http://mapknitter.org/
http://flightriot.com/software/visual-sfm/

Tutorials and Publications:

Fundamentals of Remote Sensing
http://www.nrcan.gc.ca/earth-sciences/geography-boundary/remote-sensing/fundamentals/1430
The Canada Centre for Remote Sensing offers this tutorial on remote sensing technology and its applications, for senior high school or early university level and touches on physics, environmental sciences, mathematics, computer sciences and geography.

The Globe Program, Land Cover/Biology Chapter of Teacher’s Guide
http://www.globe.gov
Global Learning and Observations to Benefit the Environment (GLOBE) is a hands-on international environmental science and education program.

ImageJ
http://rsbweb.nih.gov/ij/
Free public domain image processing software developed at the National Institutes of Health. Use ImageJ to display, annotate, edit, calibrate, measure, analyze, process, print, and save raster (row and column) image data.  ImageJ User Guide:
http://rsbweb.nih.gov/ij/docs/user-guide.pdf

MultiSpec™ https://engineering.purdue.edu/~biehl/MultiSpec/  
MultiSpec™  Tutorials Purdue University Tutorials
https://engineering.purdue.edu/~biehl/MultiSpec/tutorials.html

AmericaView tutorials:  http://www.americaview.org/earth-observation-day#quicktabs_11%3D1
Go to the bottom of the page to find four tutorials.

A Quick Guide to Earth Explorer for Landsat 8
http://earthobservatory.nasa.gov/blogs/elegantfigures/2013/05/31/a-quick-guide-to-earth-explorer-for-landsat-8/