Here you can find a list of useful resources:
Google Trends (find trends on Google)
Exploding Topics (find topics that have increasing interest)
Jungle Scout (find trends on Amazon)
Google and other Search Engines Keyword Search and SEO Tools
Google Keyword Tool (need to register)
AnswerThePublic (find long tail keywords)
Ubersuggest – SEO Analyzer (in-depth SEO Tool)
Websites Monitoring & Benchmarking
Do you have other resources and tools to suggest for this page?
Send a mail request to firstname.lastname@example.org.