Keyword research is the first step in SEO of a new website. While there are many tools available (link to Adwords), these are not sufficient; especially when it comes to less popular or trending keywords.
Keyword research need very extensive and thorough research so that we can find less competitive and high-ranking keywords.
List of Advanced Keyword Research Tools
1. Google Insights for Search
There are multiple tools that give you search volume. But some keywords may have low search volume but high growth rate. These keywords may become very popular and worth targeting in future even if they are not very popular today. The good part is that you can start building links for them and rank before they become popular. This keyword gives the trend of search volume for a keyword. You can limit it to a particular country or a state in that country. Also you can view for a particular category. It also allows you to compare the trends of various keywords. Top searches and rising searches at the bottom of this page offer more information about related searches.
2. Google Trends Keyword Demand Prediction
This tool is similar to Google Insights, but it is very good to find search trends for websites. Further it gives other websites that users generally visit and keywords that they use. This information can be used to further refine the keyword list. Another important way to use this website to find out currently trending searches if you want to write an article based on news which may not have been picked by media yet.
When you start typing a search, google makes suggestions related to the keyword already typed. Ubersuggest takes these keywords and shows them to you in list format. This saves a lot of efforts.
4. Similar Search on Google
When you make any search google shows searches similar to your current search at the bottom of the page. This is of immense use if you want to target long tail keywords. No other google tool generally shows long tail searches that this tool shows.
5. Meta keywords
While meta keywords has lost relevance in ranking long time back, many websites still keep it in the hope that it might help. The good part is that this list is visible to everybody and now you can use hours of research the SEO team of competitor's website might have put in. Do it across 3 to 4 websites and you are pretty close to a comprehensive list of popular keywords.