("Digital Essentials" by Edith Cowan University Library)
A good list of the varied tools available for synchronous and asynchronous collaboration from Charles Darwin University.
("23 Things" by Charles Darwin University Library Creative Commons Attribution 4.0 International License)
A handy table from The University of Queensland that compares the features, accessibility and limitations of many collaborative tools, and lists where you can find user support for each one.
("Digital Essentials" by UQ Library Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License)
This module from the The University of Queensland Library explains advantages and disadvantages of different online communication methods:
("Digital Essentials" by The University of Queensland Library licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.)