Here are some relevant websites I have come across that are useful perhaps?

"The e-learning tools listed below [at this site] are those that teachers are currently using in the construction trades. Many of them are free (F) while others have to be purchased ($)."

These tools are not construction trade specific but are e-learning specific.

The Digital Divide - Barriers to e-learning.

Considerations to be aware of when looking at e-learning options. This is a document well worth reading, with overviews and details of the barriers that people face. ...(AISR) .pdf