• Here is an article on how to write well for the sciences.

https://cseweb.ucsd.edu/~swanson/papers/science-of-writing.pdf

• From Carnegie Mellon School of Computer Science, advice in all areas of graduate writing, primarily for Computer Science majors.

http://www.cs.cmu.edu/afs/cs.cmu.edu/user/mleone/web/how-to.html

• Writing Reports for Science and Engineering is a website with very clear examples and advice on report writing.

http://www.usyd.edu.au/learningcentre/wrise/

• Penn State has a great collection of guidelines for graduate students in Engineering or Sciences when writing or presenting.

http://www.writing.engr.psu.edu/writing.html

• English Solutions for Engineering and Sciences Research Writing: A guide for English learners to publish in international journals, by Adam Turner.

http://www.hanyangowl.org/media/textbook/engsciresearchwritingbook.pdf

• Handbook for writing in Engineering from the University of Toronto.

http://ecp.engineering.utoronto.ca/online-handbook/

• Handbook of Biomedical Research Writing, by Jocelyn Graf.
  http://www.hanyangowl.org/media/biomedical/handbookbiomedicalwriting.pdf
  

• The Commonwealth of Learning (COL) has online modules for writing for the World Health Organization.
  http://colelearning.net/who/guide/page1.html
  

• The Commonwealth of Learning (COL) also has a printable module for business writing.

http://colelearning.net/who/guide/page1.html