I would suggest that you look through Mind Tools and the Management Library – both are incredible online resources:
The full Mind Tools toolkit contains more than 900 management, career and thinking skills, including: Leadership Skills, Team Management, Strategy Tools, Problem Solving, Decision Making, Project Management, Time Management, Stress Management, Communication Skills and much more.
The Management Library is a vast resource of free, online and practical information. It contains 1000s of articles about personal, professional and organisational development. There are approximately 650 topics in the Management Library, spanning almost 10,000 links. Each topic has additionally recommended books and related Library topics.
If you need other resources not listed here then please email me and I will try to find something for you.