1. AdWords Keyword Tool
2. Google Search-Based Keyword Tool
3. Keyword Discovery
4. Wordtracker
5. Google Suggest
6. Yahoo! Search Assist
7. Ask TypeAhead Search Suggestions
8. Rank Tracker
Re: 8 Popular Keyword Research Tools
From all above keyword suggestion tools google adwords as well as word tracker both are shown very perfect result for deciding keywords.
Re: 8 Popular Keyword Research Tools
I use Google Adwords Keyword tool for target the keywords for my websites. It provides monthly local and global searches means demand related to my suggested keywords. After then I target my keywords as their demands. Some times I can't suggest the keywords for my websites then It suggest the relevant keywords related to my website.
Re: 8 Popular Keyword Research Tools
Above among all the keyword tool i personally use "Google AdWords Keyword Tool" which gives me accurate result than others.
Re: 8 Popular Keyword Research Tools
Where're semrush, spyfu, keywordspy? They are very popular advanced keyword research tools.
Re: 8 Popular Keyword Research Tools
Here are some more tools that I use for keyword research and analysis (including actual performa):
Google Adpreview tool
google trends
google analytiics
google webmaster
Re: 8 Popular Keyword Research Tools
I am using the Google Adwords keyword tool and do some competitor site analysis for keyword research