WordStream has other free keyword tools including the Keyword Niche finder, Keyword Grouper and Negative Keyword Tool, all which can help further refine your keyword lists. Despite having limited features, WordStream.com is considered as one of the remarkable PPC management tools.
The PPC tools of WordStream offers the marketers to create optimization continuously and further enlarge their PPC marketing endeavors via increased keyword planning, keyword analytics, keyword alliance, as well as long tail keyword exploration. The tool provides more diversified long-tail keyphrases than the Keyword Planner, and all the provided suggestions are more tightly related than the previously mentioned tools. It claims to represent over a trillion search queries and non-paying users can search up to 30 times a day.