“Do you have suggestions of ESL resources that can be downloaded, for teaching writing skills to engineering professionals?”
I recommend using The Linguist system. Engineers can import any electronic document they are interested in and save the key words and phrases to their personal database. They can then systematically review these new words and phrases to really get used to them.
You, the teacher, can work with them and correct their writing using our unique writing correction system. In that way you can direct them towards words and phrases that will make their writing more natural and persuasive.
Check our how The Linguist system can help your students and expand your reach as a teacher. The Linguist is a powerful platform for teachers of all levels.