What third-party tools do you use for keyword discovery?

Outside of Google's own search query, there are plenty of tools to help discover new and related keywords. Make sure your expert is aware of the following:

    Google Keyword Planner Tool.
    SpyFu.
    SEMrush.
    Bing Keyword Research Tool.

There are some third-party tools which you can use for keyword discovery:
1. Google Keyword Planner
2. KWFinder
3. Moz's Keyword Explorer
4. Keyword Tool
5. SEMrush.