Self help workbooks and modules providing support for many common mental health difficulties: http://www.cci.health.wa.gov.au/resources/consumers.cfm
https://www.ntw.nhs.uk/pic/selfhelp/ CBT
Self help intervention templates and materials which can be of benefit:
https://www.getselfhelp.co.uk//
Excellent blog detailing psychological interventions and resources:
http://goodmedicine.org.uk/goodknowledge